RFR: 8288064: Class initialization locking [v3]

[Coleen Phillimore]

> Use a native JVM monitor and state for mutual exclusion for class linking and initialization.  See CR for more details.
> Tested with tier1-8. tiers 1-4 on Oracle supported platforms and 5-8 on linux-x64-debug.  There isn't any platform dependent code in this change.

Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:

  Renamed is_reentrant again and added an assert.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/9141/files
  - new: https://git.openjdk.org/jdk/pull/9141/files/c393cfb4..2a50f311

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9141&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9141&range=01-02

  Stats: 13 lines in 4 files changed: 3 ins; 1 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/9141.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9141/head:pull/9141

PR: https://git.openjdk.org/jdk/pull/9141