[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
diff --git a/llvm/lib/Target/X86/X86InstrInfo.h b/llvm/lib/Target/X86/X86InstrInfo.h
index 532e780..600e392 100644
--- a/llvm/lib/Target/X86/X86InstrInfo.h
+++ b/llvm/lib/Target/X86/X86InstrInfo.h
@@ -152,6 +152,8 @@
                             MemOp2RegOpTableType &M2RTable,
                             unsigned RegOp, unsigned MemOp, unsigned Flags);
 
+  virtual void anchor();
+
 public:
   explicit X86InstrInfo(X86TargetMachine &tm);