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

[Kim Barrett]

On Mon, 18 Sep 2023 19:29:14 GMT, Antonios Printezis <tonyp at openjdk.org> wrote:

> How about something like this in `zPageAllocator.cpp` / `xPageAllocator.cpp` as a compromise?
> 
> ```
> +    PRAGMA_DIAG_PUSH
> +    PRAGMA_STRINGOP_OVERFLOW_IGNORED
>      // Record flushed pages as claimed
>      Atomic::add(&_claimed, flushed);
> +    PRAGMA_DIAG_POP
> ```
> 
> This should only disable the warning for the two uses of `Atomic::add()` that exhibit the issue.

I think I'd prefer

RISCV_ONLY(PRAGMA_STRINGOP_OVERFLOW_IGNORED)

unless and until we encounter the problem for some other platform.

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PR Comment: https://git.openjdk.org/jdk/pull/15593#issuecomment-1724625187