[PATCH] Implements -mfpu=softvfp+variants on ARM driver

[Renato Golin]

  After some discussions, the conclusion is that any flag should override the target triple, including mfpu, so we should always emit the soft-float-abi flag regardless of the triple. But the warning is still nice to have.

Hi mcrosier, bogden, joey,

http://llvm-reviews.chandlerc.com/D2817

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2817?vs=7173&id=7176#toc

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