RFR: 8330464: hserr generic events - add entry for the before_exit calls [v2]

[Matthias Baesken]

> We currently miss a hs_err file generic event entry for before_exit calls. Those would be helpful to see clearly that a crash happened in a shutdown phase (we had this case recently and would have liked to have a hserr event log entry showing this more clearly).
> 
> Additionally while testing the event I called System.exit(0)  to check the event.
> This showed a native backtrace like this 
> 
>  Stack: [0x00007f1cfe825000,0x00007f1cfe926000],  sp=0x00007f1cfe924530,  free space=1021k
> Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
> V  [libjvm.so+0x8fb21b]  before_exit(JavaThread*, bool)+0x4bb  (java.cpp:376)
> V  [libjvm.so+0x9da27c]  JVM_Halt+0x6c  (jvm.cpp:442)
> j  java.lang.Shutdown.halt0(I)V+0 java.base at 23.0.0.1-internal
> j  java.lang.Shutdown.halt(I)V+7 java.base at 23.0.0.1-internal
> j  java.lang.Shutdown.exit(I)V+16 java.base at 23.0.0.1-internal
> j  java.lang.Runtime.exit(I)V+14 java.base at 23.0.0.1-internal
> j  java.lang.System.exit(I)V+4 java.base at 23.0.0.1-internal
> 
> So the comment in thread.cpp seems to be outdated, Threads::destroy_vm()  is not in the callstack  and vm_exit() is not seen as well in the callstack so probably the comment needs adjustment.

Matthias Baesken has updated the pull request incrementally with one additional commit since the last revision:

  adjust comment in threads.cpp

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/18809/files
  - new: https://git.openjdk.org/jdk/pull/18809/files/e78af305..30a65604

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18809&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18809&range=00-01

  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/18809.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18809/head:pull/18809

PR: https://git.openjdk.org/jdk/pull/18809