RFR: 8292559: Add test for -XX:+CheckJNICalls showing changed signal handlers [v2]

[Thomas Stuefe]

On Thu, 18 Aug 2022 15:11:22 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
>
> Harold Seigel has updated the pull request incrementally with one additional commit since the last revision:
> 
>   remove ifdef _cplusplus etc.

Still good.

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