RFR(m): java.nio.Bits.unaligned() doesn't return true on ppc

[Hiroshi H Horii]

Dear all:

Can I please request reviews for the following change?
This change was created for JDK 8.

Some open sources (such as Spark 2.0) check java.nio.Bits.unaligned() 
to recognize support of unaligned memory access in platform. 
Though ppc64 and ppc64le support it, unaligned() returns false. 

In JDK 9, this method returns unalignedAccess() of 
jdk.internal.misc.Unsafe
that doesn't exist in JDK8.

jira: https://bugs.openjdk.java.net/browse/JDK-8165231
webrev: http://cr.openjdk.java.net/~gromero/8165231/
(Due to my login issue to the cs.openjdk.java.net, Gustavo thankfully 
created this webrev.)

Regards,
Hiroshi
-----------------------
Hiroshi Horii, Ph.D.
IBM Research - Tokyo


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