[PATCH] Use comdats to avoid double initialization of weak data

[Reid Kleckner]

Closed by commit rL209555 (authored by @rnk).

http://reviews.llvm.org/D3811

Files:
  cfe/trunk/lib/CodeGen/CGDeclCXX.cpp
  cfe/trunk/lib/CodeGen/CodeGenModule.cpp
  cfe/trunk/lib/CodeGen/CodeGenModule.h
  cfe/trunk/lib/CodeGen/MicrosoftCXXABI.cpp
  cfe/trunk/test/CodeGenCXX/apple-kext.cpp
  cfe/trunk/test/CodeGenCXX/init-priority-attr.cpp
  cfe/trunk/test/CodeGenCXX/microsoft-abi-static-initializers.cpp
  cfe/trunk/test/CodeGenCXX/static-member-variable-explicit-specialization.cpp
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