RFR: 8358568：C2 compilation hits "must have a monitor" assert with -XX:-GenerateSynchronizationCode

[h]

Hi all,
  Please review this fix for JDK-8358568. It addresses a crash caused by accessing monitor info when -XX:-GenerateSynchronizationCode is set.  The fix adds a guard in Parse::do_monitor_exit() to avoid the crash.  Thank you in advance.Changes: https://github.com/openjdk/jdk8u-dev/pull/664/fileswebrev: https://openjdk.github.io/cr/?repo=jdk8u-dev&pr=664&range=00


Issue: https://bugs.openjdk.org/browse/JDK-8358568


Patch: https://git.openjdk.org/jdk8u-dev/pull/664.diff
PR: https://github.com/openjdk/jdk8u-dev/pull/664
BR

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