[lworld] RFR: 8335545: [lworld] JNI MonitorEnter doesn't throw the right exception [v2]

[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:

  Changes suggested by Coleen

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Changes:
  - all: https://git.openjdk.org/valhalla/pull/1160/files
  - new: https://git.openjdk.org/valhalla/pull/1160/files/a40efc3b..18d72953

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=valhalla&pr=1160&range=01
 - incr: https://webrevs.openjdk.org/?repo=valhalla&pr=1160&range=00-01

  Stats: 29 lines in 1 file changed: 8 ins; 16 del; 5 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