Revert "[NFC] Rename LLVM_NO_DEAD_STRIP"

This reverts commit 11c2a85db8849db1a5907e80d9966592248ef825.

cmake/modules/AddLLVM.cmake

@@ -228,7 +228,7 @@ function(add_link_opts target_name)
       # to enable. See https://sourceware.org/bugzilla/show_bug.cgi?id=17704.
     endif()
 
-    if(NOT LLVM_SUPPORT_PLUGINS)
+    if(NOT LLVM_NO_DEAD_STRIP)
       if(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
         # ld64's implementation of -dead_strip breaks tools that use plugins.
         set_property(TARGET ${target_name} APPEND_STRING PROPERTY
@@ -245,7 +245,7 @@ function(add_link_opts target_name)
         set_property(TARGET ${target_name} APPEND_STRING PROPERTY
                      LINK_FLAGS " -Wl,--gc-sections")
       endif()
-    else() #LLVM_SUPPORT_PLUGINS
+    else() #LLVM_NO_DEAD_STRIP
       if(${CMAKE_SYSTEM_NAME} MATCHES "AIX")
         set_property(TARGET ${target_name} APPEND_STRING PROPERTY
                      LINK_FLAGS " -Wl,-bnogc")

cmake/modules/HandleLLVMOptions.cmake

@@ -744,7 +744,7 @@ endif()
 # Add flags for add_dead_strip().
 # FIXME: With MSVS, consider compiling with /Gy and linking with /OPT:REF?
 # But MinSizeRel seems to add that automatically, so maybe disable these
-# flags instead if LLVM_SUPPORT_PLUGINS is set.
+# flags instead if LLVM_NO_DEAD_STRIP is set.
 if(NOT CYGWIN AND NOT WIN32)
   if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "Darwin" AND
      NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG")

tools/bugpoint/CMakeLists.txt

@@ -22,7 +22,7 @@ set(LLVM_LINK_COMPONENTS
   )
 
 # Support plugins.
-set(LLVM_SUPPORT_PLUGINS 1)
+set(LLVM_NO_DEAD_STRIP 1)
 
 add_llvm_tool(bugpoint
   BugDriver.cpp

tools/llc/CMakeLists.txt

@@ -20,7 +20,7 @@ set(LLVM_LINK_COMPONENTS
   )
 
 # Support plugins.
-set(LLVM_SUPPORT_PLUGINS 1)
+set(LLVM_NO_DEAD_STRIP 1)
 
 add_llvm_tool(llc
   llc.cpp

tools/opt/CMakeLists.txt

@@ -25,7 +25,7 @@ set(LLVM_LINK_COMPONENTS
   )
 
 # Support plugins.
-set(LLVM_SUPPORT_PLUGINS 1)
+set(LLVM_NO_DEAD_STRIP 1)
 
 add_llvm_tool(opt
   AnalysisWrappers.cpp