[PATCH][ARM] Add missing -mfpu arguments

[Richard Barton]

Hi reviewers

Attached patches add missing arguments to the -mfpu option for ARM.

The current set of supported options misses out neon-vfpv4. The first patch
addresses this omission.

I would also like to add a corresponding neon-vfpv3 argument. Note that this
is not supported by GCC, but follows the same pattern for GCC options. This
is patch number 2.

I have split the patch in two as hopefully patch 1 will cause no
controversy.

Please review.

Thanks
Rich
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