RFR(M): 8028515: PPC64 (part 113.2): opto: Introduce MemBarAcquire/ReleaseWide.

[Lindenmaier, Goetz]

Hi,

The c2 compiler inserts MemBarAcquire/Release nodes to enforce memory ordering in various places. Some order a certain load/store with other operations. Inline_unsafe_fence() inserts MemBars that do not correspont to a memory operation. So far, the same nodes were used.

This change introduces MemBarAcquire/ReleaseWide to use where no dedicated load/store is ordered. With this change, these nodes can be matched differently, what is needed on PPC64.

When reviewing 8024921 (part 113) we decided to avoid #defines in inline_unsafe_fence() and to introduce new MemBar operations.

Please review and test this change.
http://cr.openjdk.java.net/~goetz/webrevs/8028515-0-wide/

Best regards,
  Goetz.
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