[PATCH] CodeGen: Fix linkage of reference temporaries

[David Majnemer]

Hi rsmith,

A reference temporary should inherit the linkage of the variable it
initializes.  Otherwise, we may hit cases where a reference temporary
wouldn't have the same value in all translation units.

http://reviews.llvm.org/D3515

Files:
  lib/CodeGen/CodeGenModule.cpp
  test/CodeGenCXX/const-init-cxx11.cpp
  test/CodeGenCXX/const-init-cxx1y.cpp
  test/CodeGenCXX/cxx0x-initializer-stdinitializerlist-pr12086.cpp
  test/CodeGenCXX/cxx0x-initializer-stdinitializerlist-startend.cpp
  test/CodeGenCXX/cxx0x-initializer-stdinitializerlist.cpp
  test/CodeGenCXX/cxx11-thread-local.cpp
  test/CodeGenCXX/temporaries.cpp
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