RFR: 8214205: PPC64: Add instructions for counting trailing zeros

[Michihiro Horie]

Dear all,

Would you please review the following change that enables POWER9’s
instructions for counting trailing zeros?

Bug: https://bugs.openjdk.java.net/browse/JDK-8214205
Webrev: http://cr.openjdk.java.net/~mhorie/8214205/webrev.00/

Simple micro benchmark attached showed improvements by around 30%.
(See attached file: CNTTZTest.java)

Currently, Gustavo at IBM can test POWER9 specific changes. (Thanks Gustavo!)


Best regards,
--
Michihiro,
IBM Research - Tokyo
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