RFR: 8350111: [PPC] AsyncGetCallTrace crashes when called while handling SIGTRAP [v3]

[Richard Reingruber]

> With this change `JavaThread::pd_get_top_frame_for_profiling()` fails if the current thread is found to be `_thread_in_Java` but the CodeCache does not contain its pc.
> 
> This will prevent crashes as described by the JBS item.
> 
> The fix might be too conservative for situations where a thread doen't change its thread state when calling native code, e.g. using the Foreign Function & Memory API. The difficulty finding a less defensive fix is that one must detect if a valid pc can be found in the caller's ABI before constructing that frame.
> 
> Testing:
> 
> * DaCapo Tomcat with async-profiler on a fastdebug build.
> * Tier 1-4 of hotspot and jdk on the main platforms and also on Linux/PPC64le and AIX.

Richard Reingruber has updated the pull request incrementally with one additional commit since the last revision:

  Improve whitespace

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Changes:
  - all: https://git.openjdk.org/jdk/pull/23641/files
  - new: https://git.openjdk.org/jdk/pull/23641/files/9a2eedc5..92b0ef93

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23641&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23641&range=01-02

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/23641.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23641/head:pull/23641

PR: https://git.openjdk.org/jdk/pull/23641