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

[Reid Kleckner]

Hi rsmith,

Initializers of global data that can appear multiple TUs (static data
members of class templates or __declspec(selectany) data) are now in a
comdat group keyed on the global variable being initialized.  On
non-Windows platforms, this is a code size and startup time
optimization.  On Windows, this is necessary for ABI compatibility with
MSVC.

Fixes PR16959.

http://reviews.llvm.org/D3811

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