Revert r194865 and r194874.

This change is incorrect. If you delete virtual destructor of both a base class
and a subclass, then the following code:
  Base *foo = new Child();
  delete foo;
will not cause the destructor for members of Child class. As a result, I observe
plently of memory leaks. Notable examples I investigated are:
ObjectBuffer and ObjectBufferStream, AttributeImpl and StringSAttributeImpl.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194997 91177308-0d34-0410-b5e6-96231b3b80d8

lib/ExecutionEngine/ExecutionEngine.cpp

@@ -15,7 +15,6 @@
 #define DEBUG_TYPE "jit"
 #include "llvm/ExecutionEngine/ExecutionEngine.h"
 #include "llvm/ExecutionEngine/JITMemoryManager.h"
-#include "llvm/ExecutionEngine/ObjectCache.h"
 #include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/Statistic.h"
 #include "llvm/ExecutionEngine/GenericValue.h"
@@ -40,9 +39,6 @@ using namespace llvm;
 STATISTIC(NumInitBytes, "Number of bytes of global vars initialized");
 STATISTIC(NumGlobals  , "Number of global vars initialized");
 
-// pin vtable to this file
-void ObjectCache::anchor() {}
-
 ExecutionEngine *(*ExecutionEngine::JITCtor)(
   Module *M,
   std::string *ErrorStr,

lib/ExecutionEngine/RuntimeDyld/JITRegistrar.h

@@ -16,7 +16,6 @@ namespace llvm {
 
 /// Global access point for the JIT debugging interface.
 class JITRegistrar {
-  virtual void anchor();
 public:
   /// Instantiates the JIT service.
   JITRegistrar() {}

lib/ExecutionEngine/RuntimeDyld/ObjectImageCommon.h

@@ -23,7 +23,6 @@ namespace llvm {
 class ObjectImageCommon : public ObjectImage {
   ObjectImageCommon(); // = delete
   ObjectImageCommon(const ObjectImageCommon &other); // = delete
-  virtual void anchor();
 
 protected:
   object::ObjectFile *ObjFile;

lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp

@@ -13,7 +13,6 @@
 
 #define DEBUG_TYPE "dyld"
 #include "llvm/ExecutionEngine/RuntimeDyld.h"
-#include "JITRegistrar.h"
 #include "ObjectImageCommon.h"
 #include "RuntimeDyldELF.h"
 #include "RuntimeDyldImpl.h"
@@ -29,11 +28,6 @@ using namespace llvm::object;
 // Empty out-of-line virtual destructor as the key function.
 RuntimeDyldImpl::~RuntimeDyldImpl() {}
 
-// pin JITRegistrar.h and ObjectImage*.h vtables to this file
-void JITRegistrar::anchor() {}
-void ObjectImage::anchor() {}
-void ObjectImageCommon::anchor() {}
-
 namespace llvm {
 
 void RuntimeDyldImpl::registerEHFrames() {