RFR: 8337163: Improve SA error message when failing to attach to a core file

[Alex Menkov]

On Fri, 30 Aug 2024 20:54:33 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

> When SA fails to open/attach to a core file on linux or OSX, include a note about using LIBSAPROC_DEBUG=1 in the error message. No one remembers this magic, so it is useful to provide here. Even I always have to resort to looking up the symbol in the SA source since I can never remember it. The extra output you get with LIBSAPROC_DEBUG=1 is often enough for the user to determine the root cause, or at least help an SA engineer determine the cause.
> 
> Test by running all SA tests and also tier1.
> 
> Also did manual testing with forced errors reading core files to make sure the error output is as expected.

Marked as reviewed by amenkov (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/20800#pullrequestreview-2273635470