RFR(M): 8158232: PPC64: improve byte, int and long array copy stubs by using VSX instructions

[Michihiro Horie]

Dear all,

Could you please review the following webrev?

http://cr.openjdk.java.net/~mdoerr/8158232_PPC_vsx_copy/webrev.00/

This change improves performance of disjoint arraycopy of byte, int, and
long by using VSX load/store instructions.

Discussion started from:
http://mail.openjdk.java.net/pipermail/ppc-aix-port-dev/2016-May/002483.html

Performance improvement with micro benchmarks is shown in:
http://mail.openjdk.java.net/pipermail/ppc-aix-port-dev/2016-May/002531.html

Thank you very much,

Best regards,
--
Michihiro Horie,
IBM Research - Tokyo
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