RFR: 8267893: Improve jtreg test failure handler do get native/mixed stack traces for cores and live processes [v6]

[Igor Ignatyev]

On Wed, 9 Jun 2021 19:00:39 GMT, Leonid Mesnik <lmesnik at openjdk.org> wrote:

>> EFH is improved to process cores and get mixed stack traces with jhsdb and native stack traces with gdb/lldb. It might be useful because hs_err doesn't contain info about all threads, sometimes it is even not generated.
>
> Leonid Mesnik has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fxies

Marked as reviewed by iignatyev (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/4234