RFR: 8372380: Make hs_err reporting more robust for unattached threads [v2]

[David Holmes]

> There were a number of places where the code called by hs_err reporting assumed/required an attached current thread. These would then cause secondary failures during hs_err reporting. Using a simple example of an unattached thread causing a SEGV I went through and eliminated all the problems I encountered. In some cases the thread dependency was obvious and easy to address directly, but in others we just skip that section at the top-level.
> 
> Testing:
>  - manual inspection of hs_err file, for different GCs
>  - tiers 1-3 sanity
> 
> Thanks

David Holmes has updated the pull request incrementally with one additional commit since the last revision:

  Missing include

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Changes:
  - all: https://git.openjdk.org/jdk/pull/28470/files
  - new: https://git.openjdk.org/jdk/pull/28470/files/64bdb1b2..5d59c7e9

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28470&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28470&range=00-01

  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/28470.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28470/head:pull/28470

PR: https://git.openjdk.org/jdk/pull/28470