RFR(L): 8198894: [PPC64] More generic vector CRC implementation

[Doerr, Martin]

Hi,

I have implemented a more generic version of the vector instruction based CRC code.
It supports CRC32C and Big Endian, too.

The peak performance was even better for large input streams. I got almost 40GB/s.
Some smaller length may be slower than with the old version.
Maybe somebody from IBM would like to double-check performance.

Please review:
http://cr.openjdk.java.net/~mdoerr/8198894_PPC64_CRC32/webrev.00/
(hoping you like math :))

Best regards,
Martin

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