[PATCH] Fix assertion failure on DeferredDeclsToEmit.

[Logan Chien]

Hi rafael,

The assertion failure will be raised by TryEmitDefinitionAsAlias()
because it will call Entry->replaceAllUsesWith(Alias) and Entry
might be hold by the AssertingVH, which will become a dangling
pointer after RAUW.

This commit fixes the problem by replacing AssertingVH with
TrackingVH.

Note: This issue is partially fixed by r217874, since the usage of
GetAddrOfGlobal() is replaced by getAddrOfCXXStructor() with DontDefer=true.

http://reviews.llvm.org/D5743

Files:
  lib/CodeGen/CodeGenModule.h
  test/CodeGenCXX/ctor-dtor-alias-assertingvh.cpp
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