RFR:8166684:implement intrinsic code with vector instructions for Unsafe.copyMemory()

[Michihiro Horie]

Dear all,

Could I please request reviews for the following change?
This change was created for JDK9.

I added fixes to the intrinsic code for sun.misc.Unsafe.copyMemory() by
using VSX.
Since Spark often invokes Unsafe.copyMemory(), it is beneficial to use the
vector instructions for these intrinsic code.

jira: https://bugs.openjdk.java.net/browse/JDK-8166684
diff: (See attached file: unsafe-copymemory-openjdk9.diff)

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