[libc++] Assume that coroutines are available in C++20

All supported compilers have support for coroutines in C++20 now.

Differential Revision: https://reviews.llvm.org/D145086

libcxx/docs/DesignDocs/ExperimentalFeatures.rst

@@ -156,7 +156,7 @@ We have not yet shipped an implementation of the Parallelism TS.
 The Coroutines TS was accepted for C++20.
 An implementation of the Coroutines TS was shipped in LLVM 5.0 in namespace ``std::experimental``,
 and C++20 Coroutines shipped in LLVM 14.0. The implementation of the Coroutines TS in ``std::experimental``
-will be removed in LLVM 16.0.
+has been removed in LLVM 17.0.
 
 `Networking TS <https://wg21.link/N4656>`__
 -------------------------------------------

libcxx/test/std/language.support/support.coroutines/coroutine.handle/coroutine.handle.capacity/operator_bool.pass.cpp

@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: libcpp-no-coroutines
 
 // <coroutine>
 

libcxx/test/std/language.support/support.coroutines/coroutine.handle/coroutine.handle.compare/equal_comp.pass.cpp

@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: libcpp-no-coroutines
 
 // <coroutine>
 

libcxx/test/std/language.support/support.coroutines/coroutine.handle/coroutine.handle.compare/less_comp.pass.cpp

@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: libcpp-no-coroutines
 
 // <coroutine>
 

libcxx/test/std/language.support/support.coroutines/coroutine.handle/coroutine.handle.completion/done.pass.cpp

@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: libcpp-no-coroutines
 
 // <coroutine>
 

libcxx/test/std/language.support/support.coroutines/coroutine.handle/coroutine.handle.con/assign.pass.cpp

@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: libcpp-no-coroutines
 
 // <coroutine>
 

libcxx/test/std/language.support/support.coroutines/coroutine.handle/coroutine.handle.con/construct.pass.cpp

@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: libcpp-no-coroutines
 
 // <coroutine>
 

libcxx/test/std/language.support/support.coroutines/coroutine.handle/coroutine.handle.export/address.pass.cpp

@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: libcpp-no-coroutines
 
 // <coroutine>
 

libcxx/test/std/language.support/support.coroutines/coroutine.handle/coroutine.handle.export/from_address.pass.cpp

@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: libcpp-no-coroutines
 
 // <coroutine>
 

libcxx/test/std/language.support/support.coroutines/coroutine.handle/coroutine.handle.hash/hash.pass.cpp

@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: libcpp-no-coroutines
 
 // <coroutine>
 

libcxx/test/std/language.support/support.coroutines/coroutine.handle/coroutine.handle.noop/noop_coroutine.pass.cpp

@@ -8,7 +8,6 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: ubsan
-// UNSUPPORTED: libcpp-no-coroutines
 
 // <coroutine>
 // struct noop_coroutine_promise;

libcxx/test/std/language.support/support.coroutines/coroutine.handle/coroutine.handle.prom/promise.pass.cpp

@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: libcpp-no-coroutines
 
 // <coroutine>
 

libcxx/test/std/language.support/support.coroutines/coroutine.handle/coroutine.handle.resumption/destroy.pass.cpp

@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: libcpp-no-coroutines
 
 // <coroutine>
 

libcxx/test/std/language.support/support.coroutines/coroutine.handle/coroutine.handle.resumption/resume.pass.cpp

@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: libcpp-no-coroutines
 
 // <coroutine>
 

libcxx/test/std/language.support/support.coroutines/coroutine.handle/void_handle.pass.cpp

@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: libcpp-no-coroutines
 
 #include <coroutine>
 #include <type_traits>

libcxx/test/std/language.support/support.coroutines/coroutine.traits/promise_type.pass.cpp

@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: libcpp-no-coroutines
 
 #include <coroutine>
 #include <type_traits>

libcxx/test/std/language.support/support.coroutines/coroutine.trivial.awaitables/suspend_always.pass.cpp

@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: libcpp-no-coroutines
 
 #include <coroutine>
 #include <type_traits>

libcxx/test/std/language.support/support.coroutines/coroutine.trivial.awaitables/suspend_never.pass.cpp

@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: libcpp-no-coroutines
 
 #include <coroutine>
 #include <type_traits>

libcxx/test/std/language.support/support.coroutines/end.to.end/await_result.pass.cpp

@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: libcpp-no-coroutines
 
 #include <coroutine>
 #include <cassert>

libcxx/test/std/language.support/support.coroutines/end.to.end/bool_await_suspend.pass.cpp

@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: libcpp-no-coroutines
 
 // See https://llvm.org/PR33271
 // UNSUPPORTED: ubsan

libcxx/test/std/language.support/support.coroutines/end.to.end/expected.pass.cpp

@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: libcpp-no-coroutines
 
 #include <coroutine>
 #include <cassert>

libcxx/test/std/language.support/support.coroutines/end.to.end/fullexpr-dtor.pass.cpp

@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: libcpp-no-coroutines
 
 #include <coroutine>
 #include <cassert>

libcxx/test/std/language.support/support.coroutines/end.to.end/generator.pass.cpp

@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: libcpp-no-coroutines
 
 // See https://llvm.org/PR33271
 // UNSUPPORTED: ubsan

libcxx/test/std/language.support/support.coroutines/end.to.end/go.pass.cpp

@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: libcpp-no-coroutines
 
 #include <cassert>
 #include <coroutine>

libcxx/test/std/language.support/support.coroutines/end.to.end/multishot_func.pass.cpp

@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: libcpp-no-coroutines
 
 #include <coroutine>
 #include <cassert>

libcxx/test/std/language.support/support.coroutines/end.to.end/oneshot_func.pass.cpp

@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: libcpp-no-coroutines
 
 #include <coroutine>
 #include <vector>

libcxx/utils/libcxx/test/features.py

@@ -81,10 +81,6 @@ DEFAULT_FEATURES = [
         name="fdelayed-template-parsing",
         when=lambda cfg: hasCompileFlag(cfg, "-fdelayed-template-parsing"),
     ),
-    Feature(
-        name="libcpp-no-coroutines",
-        when=lambda cfg: featureTestMacros(cfg).get("__cpp_impl_coroutine", 0) < 201902,
-    ),
     Feature(
         name="has-fobjc-arc",
         when=lambda cfg: hasCompileFlag(cfg, "-xobjective-c++ -fobjc-arc")