[PATCH] [ARM] Handle conflicts between -mfpu and -mfloat-abi options

[Asiri Rathnayake]

Hi Renato,

I've updated the patch with the [-mfloat-abi=soft -mfpu=<fpu>] warning removed and strengthening the test cases.

Will commit if there's no objection.

Best,

--Asiri

http://reviews.llvm.org/D5460

Files:
  include/clang/Basic/DiagnosticDriverKinds.td
  lib/Driver/ToolChains.cpp
  lib/Driver/Tools.cpp
  lib/Driver/Tools.h
  test/Driver/arm-mfpu.c
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