RFR: 8315794: RISC-V: build fails with GCC 12.3

[Kim Barrett]

On Thu, 7 Sep 2023 11:08:45 GMT, Andrew Haley <aph at openjdk.org> wrote:

>> The build failure happens when building on RISC-V with GCC 12.3. Is there a better way to address this than disabling the stringop-overflow warnings for the two files in question?
>
> Just for the record, this is very likely https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104475 .

I'd like to not disable the warnings without a better understanding of the problem.  I agree with @theRealAph that gcc
bug 104475 is likely where the warning is coming from.  But it may be that giving gcc better control flow information
via appropriate `[[noreturn]]` or (something like) `std::unreachable()` might be better.

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PR Comment: https://git.openjdk.org/jdk/pull/15593#issuecomment-1710607492