[PATCH] Don't segfault in EmitCXXGlobalInitFunc when main file is a membuf

[Keno Fischer]

Addressed review comments.

http://reviews.llvm.org/D5043

Files:
  lib/CodeGen/CGDeclCXX.cpp
  unittests/CMakeLists.txt
  unittests/CodeGen/BufferSourceTest.cpp
  unittests/CodeGen/CMakeLists.txt
  unittests/CodeGen/Makefile
  unittests/Makefile
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