[PATCH] Pass -mglobal-merge as a module flag metadata.

[Ahmed Bougacha]

- Switch to a "Global Merge" flag, enabled by default.
- Generate i32 values instead of strings.
- Add X86 tests (to make sure we don't emit the flags there).


http://reviews.llvm.org/D7968

Files:
  include/clang/Driver/Options.td
  lib/CodeGen/BackendUtil.cpp
  lib/CodeGen/CodeGenModule.cpp
  lib/CodeGen/CodeGenModule.h
  lib/Driver/Tools.cpp
  lib/Frontend/CompilerInvocation.cpp
  test/CodeGen/global-merge.c
  test/Driver/mglobal-merge.c
  test/Driver/mno-global-merge.c

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