[ExecutionEngine] Move ObjectCache::anchor from MCJIT to ExecutionEngine.

ObjectCache is an ExecutionEngine utility, so its anchor belongs there. The
practical impact of this change is that ORC users no longer need to link MCJIT
to use ObjectCaches.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@280616 91177308-0d34-0410-b5e6-96231b3b80d8

lib/ExecutionEngine/ExecutionEngine.cpp

@@ -18,6 +18,7 @@
 #include "llvm/ADT/Statistic.h"
 #include "llvm/ExecutionEngine/GenericValue.h"
 #include "llvm/ExecutionEngine/JITEventListener.h"
+#include "llvm/ExecutionEngine/ObjectCache.h"
 #include "llvm/ExecutionEngine/RTDyldMemoryManager.h"
 #include "llvm/IR/Constants.h"
 #include "llvm/IR/DataLayout.h"
@@ -62,6 +63,8 @@ ExecutionEngine *(*ExecutionEngine::InterpCtor)(std::unique_ptr<Module> M,
 
 void JITEventListener::anchor() {}
 
+void ObjectCache::anchor() {}
+
 void ExecutionEngine::Init(std::unique_ptr<Module> M) {
   CompilingLazily         = false;
   GVCompilationDisabled   = false;

lib/ExecutionEngine/MCJIT/MCJIT.cpp

@@ -29,8 +29,6 @@
 
 using namespace llvm;
 
-void ObjectCache::anchor() {}
-
 namespace {
 
 static struct RegisterJIT {