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

[Asiri Rathnayake]

Currently we allow combinations of options like the ones below:

```
./clang -target <...> -mfpu=vfp4 -mfloat-abi=soft ...
./clang -target <...> -mfloat-abi=hard -mfpu=none ...
```

Such usage should be warned / prevented because those options conflict in meaning. This patch implements the following scheme when presented with such options:

-mfloat-abi=soft -mfpu=FPU => warn, ignore the FPU, use soft-float

-mfloat-abi=softfp -mfpu=none => warn, use soft-float

-mfloat-abi=hard -mfpu=none => downgradable error, use soft-float

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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