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

[Keno Fischer]

Fixed minor nits, changed __GLOBAL_I_a to _GLOBAL__sub_I__null_ and added a test. I'd appreciate if somebody who uses CMake to run the unittests could test this. I tried to modify the CMakeLists by pattern matching, but haven't actually tested this.

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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