RFR: 8372039: post_sampled_object_alloc is called while lock is handled [v5]

[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.

Leonid Mesnik has updated the pull request incrementally with seven additional commits since the last revision:

 - Apply suggestion from @alexmenkov
   
   Co-authored-by: Alex Menkov <alexey.menkov at oracle.com>
 - Apply suggestion from @alexmenkov
   
   Co-authored-by: Alex Menkov <alexey.menkov at oracle.com>
 - Apply suggestion from @alexmenkov
   
   Co-authored-by: Alex Menkov <alexey.menkov at oracle.com>
 - Update test/hotspot/jtreg/serviceability/jvmti/events/SampledObjectAlloc/SamplingDuringInit/libSamplingDuringInit.cpp
   
   Co-authored-by: Alex Menkov <alexey.menkov at oracle.com>
 - Update test/hotspot/jtreg/serviceability/jvmti/events/SampledObjectAlloc/SamplingDuringInit/SamplingDuringInit.java
   
   Co-authored-by: Alex Menkov <alexey.menkov at oracle.com>
 - Update src/hotspot/share/runtime/javaThread.hpp
   
   Co-authored-by: Alex Menkov <alexey.menkov at oracle.com>
 - Update src/hotspot/share/runtime/javaThread.cpp
   
   Co-authored-by: Alex Menkov <alexey.menkov at oracle.com>

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/28544/files
  - new: https://git.openjdk.org/jdk/pull/28544/files/f7e869b2..aaa0ccbb

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28544&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28544&range=03-04

  Stats: 9 lines in 4 files changed: 1 ins; 4 del; 4 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