RFR: 8285792: Posix signal handler modification checking issues. [v4]

[Harold Seigel]

On Tue, 26 Jul 2022 19:53:10 GMT, Harold Seigel <hseigel at openjdk.org> wrote:

>> Please review this fix for JDK-8285792.  The fix removes print statements from check_signal_handler() so that it doesn't print all the handlers every time it finds one that is modified.  Instead, it returns true if the handler is modified, false otherwise.  Its caller, user_handler(), then prints all the handlers just once even if multiple signal handlers were modified.
>> 
>> The fix also adds a check for VMError::crash_handler_adress() to check_signal_handler() to prevent it from being treated as a signal handler modification.
>> 
>> The fix was tested with Mach5 tiers 1-2 on Linux and Mac OS and Mach 5 tiers 3-5 on Linux x64.  The regression test is excluded on Windows.
>> 
>> Thanks, Harold
>
> Harold Seigel has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fix whitespace issue

Thanks David and Erik for the reviews!

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PR: https://git.openjdk.org/jdk/pull/9631