RFR: aarch64: add support for vectorizing floating-point fabs & fneg

[Andrew Haley]

On 09/26/2015 10:25 AM, Felix Yang wrote:
>     Please review the v2 patch:
> http://people.linaro.org/~felix.yang/aarch64-fabs-fneg-v2.diff
> <http://people.linaro.org/~felix.yang/aarch64-fabs-fneg-v1.diff>
>     How about this one?

That looks good.  The test case generates pleasingly vectorized code
and the patch appears not to break anything.

Thanks,
Andrew.