[PATCH] PPC64: Adds SIMD sine function for POWER8.

[GT]

This adds the vector sine function for PPC64/POWER8 VSX.

Testing with 'make check' passes all tests of the double-precision
sine function. The maximum error is 2-ulps, and is expected of the
algorithm which guarantees less than 4-ulps in error.

Tested on both PPC64 Little and Big Endian.
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