[PATCH] CodeGen: Emit constant array temporaries into read-only globals.

[Benjamin Kramer]

- Disable optimization if -fno-merge-constants is specified
- Enable optimization for records too and update test cases
- Remove bad assert
- Rename globals from ".initializer_list" to ".reftmp"
- Put new globals in the same COMDAT as the containing function


http://reviews.llvm.org/D8034

Files:
  lib/CodeGen/CGExpr.cpp
  test/CodeGenCXX/compound-literals.cpp
  test/CodeGenCXX/cxx0x-initializer-array.cpp
  test/CodeGenCXX/cxx0x-initializer-references.cpp
  test/CodeGenCXX/cxx0x-initializer-stdinitializerlist.cpp

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