[weak vtables] Remove a bunch of weak vtables

This patch removes most of the trivial cases of weak vtables by pinning them to
a single object file. The memory leaks in this version have been fixed. Thanks
Alexey for pointing them out.

Differential Revision: http://llvm-reviews.chandlerc.com/D2068

Reviewed by Andy

llvm-svn: 195064

1 files changed, 3 insertions, 1 deletions

diff --git a/llvm/lib/IR/Metadata.cpp b/llvm/lib/IR/Metadata.cpp
index bd4d9c0a077..a32d25c92ae 100644
--- a/llvm/lib/IR/Metadata.cpp
+++ b/llvm/lib/IR/Metadata.cpp
@@ -65,7 +65,7 @@ class MDNodeOperand : public CallbackVH {
 
 public:
   MDNodeOperand(Value *V) : CallbackVH(V) {}
-  ~MDNodeOperand() {}
+  virtual ~MDNodeOperand();
 
   void set(Value *V) {
     unsigned IsFirst = this->getValPtrInt();
@@ -82,6 +82,8 @@ public:
 };
 } // end namespace llvm.
 
+// Provide out-of-line definition to prevent weak vtable.
+MDNodeOperand::~MDNodeOperand() {}
 
 void MDNodeOperand::deleted() {
   getParent()->replaceOperand(this, 0);