[lworld] RFR: 8335545: [lworld] JNI MonitorEnter doesn't throw the right exception [v3]

[Frederic Parain]

> Fix JNI's MonitorEnter to throw IdentityException instead of IllegalMonitorStateException.

Frederic Parain has updated the pull request incrementally with one additional commit since the last revision:

  Removed useless statement

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Changes:
  - all: https://git.openjdk.org/valhalla/pull/1160/files
  - new: https://git.openjdk.org/valhalla/pull/1160/files/18d72953..b67b2d61

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=valhalla&pr=1160&range=02
 - incr: https://webrevs.openjdk.org/?repo=valhalla&pr=1160&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/valhalla/pull/1160.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1160/head:pull/1160

PR: https://git.openjdk.org/valhalla/pull/1160