8179527: Implement intrinsic code for reverseBytes with load/store

[Michihiro Horie]

Dear all,

Would you please review following change?

Bug: https://bugs.openjdk.java.net/browse/JDK-8179527
Webrev: http://cr.openjdk.java.net/~horii/8179527/webrev.00/

I added new intrinsic code for reverseBytes() in ppc.ad with
* match(Set dst (ReverseBytesI/L/US/S (LoadI src)));
* match(Set dst (StoreI dst (ReverseBytesI/L/US/S src)));


Best regards,
--
Michihiro,
IBM Research - Tokyo
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