RFR: 8292559: Add test for -XX:+CheckJNICalls showing changed signal handlers

[Harold Seigel]

On Thu, 18 Aug 2022 12:48:30 GMT, Harold Seigel <hseigel at openjdk.org> wrote:

> Please review this small change to add a test that option -XX:+CheckJNICalls shows changed signal handlers.  This new test is a copy of the recently deleted TestPosixSig.java with small changes.  This version of the test only checks that handlers were changed for SIGFPE and SIGILL signals.
> 
> The test was tested using Mach5 to run it on Linux, Mac OS, and Windows.
> 
> Thanks, Harold

Thanks Thomas and Coleen for suggesting adding this test and reviewing this PR!

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PR: https://git.openjdk.org/jdk/pull/9919