[PATCH] [ARM] Use TargetParser to determine FPU subtarget features

[John Brawn]

Hi rengolin,

The main effect of this is to fix anomalies where certain -mfpu options didn't disable everything that they should causing strange behaviour when combined with -mcpu or -march values that themselves enabled fpu subtarget features, e.g. -mfpu=fpv5-dp-d16 with -march=armv7em previously behaved the same as -mfpu=fpv5-sp-d16 due to fp-only-sp not being disabled.

Invalid -mfpu options now also give an error, which is consistent with the handling of the .fpu directive.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D10239

Files:
  lib/Driver/Tools.cpp
  test/Driver/arm-mfpu.c
  test/Preprocessor/arm-target-features.c

EMAIL PREFERENCES
  http://reviews.llvm.org/settings/panel/emailpreferences/
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