RFR: 8281043: Intrinsify recursive ObjectMonitor locking for PPC64 [v2]

[Martin Doerr]

> PPC64 implementation of JDK-8277180.

Martin Doerr has updated the pull request incrementally with one additional commit since the last revision:

  Shorter and better redable recursions increment sequence.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7305/files
  - new: https://git.openjdk.java.net/jdk/pull/7305/files/2428acce..1eec2373

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7305&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7305&range=00-01

  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7305.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7305/head:pull/7305

PR: https://git.openjdk.java.net/jdk/pull/7305