[PATCH] [ARM] Add tests for default value of Tag_ABI_FP_rounding.

[Charlie Turner]

This patch adds tests to check that for each CPU / architecture currently tested in `test/CodeGen/ARM/build-attributes.ll`, the `Tag_ABI_FP_rounding` attribute is "correctly" emitted. Since we appear to shooting for GCC compatibility, that's the justification for this default: GCC does it. This default is an ABI compliant choice.

There's not functional change in this patch, just adding tests for the current behaviour.

http://reviews.llvm.org/D6480

Files:
  test/CodeGen/ARM/build-attributes.ll
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