[PATCH] Add -mlong-double-64 flag

[Taiju Tsuiki]

Add CodeGen test.
Update LongDoubleFormat.

http://reviews.llvm.org/D6260

Files:
  include/clang/Basic/LangOptions.def
  include/clang/Driver/Options.td
  lib/Basic/TargetInfo.cpp
  lib/Driver/Tools.cpp
  lib/Frontend/CompilerInvocation.cpp
  test/CodeGen/long-double-64-x86.c
  test/Driver/clang_f_opts.c
  test/Sema/long-double-64.c
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