[PATCH] [ARM] Add support for Cortex-M7, FPv5-SP and FPv5-DP (Clang)

[Oliver Stannard]

The Cortex-M7 has 3 options for it's FPU: none, FPv5-SP-D16 and FPv5-DP-D16. FPv5 has the same instructions as FP-ARMv8, so it can be modeled using the same target feature, and all double-precision operations are already disabled by the fp-only-sp target features.

http://reviews.llvm.org/D5537

Files:
  lib/Basic/Targets.cpp
  lib/Driver/ToolChains.cpp
  lib/Driver/Tools.cpp
  test/Driver/arm-cortex-cpus.c
  test/Driver/arm-mfpu.c
  test/Preprocessor/arm-target-features.c
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