[8u] RFR for backport of JDK-8158012: Use SW prefetch instructions instead of BIS for allocation prefetches on SPARC Core C4

[Muthusamy Chinnathambi]

Hi,

Please review the backport of bug: "JDK-8158012: Use SW prefetch instructions instead of BIS for allocation prefetches on SPARC Core C4" to jdk8u-dev

Please note that this is not a clean backport due to conflict in comments and slight re-order of code.


Webrev: http://cr.openjdk.java.net/~shshahma/Muthu/8158012/webrev.00/
jdk9 bug: https://bugs.openjdk.java.net/browse/JDK-8158012
Original patch pushed to jdk9: http://hg.openjdk.java.net/jdk9/jdk9/hotspot/rev/eebdc7acebd4

Test:  Ran jprt and jtreg.

Regards,
Muthusamy C