RFR: 8372039: post_sampled_object_alloc is called while lock is handled

[Leonid Mesnik]

The AOT allocates objects while holding lock. The jvmti events can't be posted in such case. The allocation sampling might be just temporary disabled while AOT objects are allocated. 

I prefer to disable jvmti events for allocation only, not for AOT globally. If there are more events should be generated during AOT initialization, we might want to preserve them and post after initialization is completed. 

The existing failure could be reproduced by running tests with jvmti stress agent and ZGC enabled. Like
make run-test JTREG_JVMTI_STRESS_AGENT=debugger=true TEST=gc/z/TestGarbageCollectorMXBean.java

Note: 
I prelaced NoJvmtiVMObjectAllocMark, it was not used. Also it was incorrect. The 
NoJvmtiEventsMark should be set even if jvmti events are not enable for this thread. Since jvmti events might be enabled just in the middle of the mark.

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Commit messages:
 - 8372039: post_sampled_object_alloc is called while lock is handled

Changes: https://git.openjdk.org/jdk/pull/28544/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28544&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8372039
  Stats: 49 lines in 5 files changed: 8 ins; 30 del; 11 mod
  Patch: https://git.openjdk.org/jdk/pull/28544.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28544/head:pull/28544

PR: https://git.openjdk.org/jdk/pull/28544