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

[Renato Golin]

Hi mcrosier, bogden, joey,

The ARM compiler and GCC have a way of specifying soft float ABI with VFP hardware described here:

http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0472c/BABDGGBI.html

Mainly, softvfp == soft ABI and whatever comes later is the currently supported -mfpu flag.

This patch implements it on Clang and warns when the user is trying to force sof-float on gnueabihf targets and so on.

Fixes http://llvm.org/bugs/show_bug.cgi?id=18689.

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

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