RFR: 8312077: Fix signed integer overflow, final part [v7]

[Dean Long]

On Fri, 14 Jul 2023 19:54:25 GMT, Dean Long <dlong at openjdk.org> wrote:

>> This is hopefully the last set of integer overflow fixes for hotspot.  Some of the counters I changed to unsigned are updated in platform-specific code, so I could use some help testing on arm, ppc,  riscv, and s390.
>
> Dean Long has updated the pull request incrementally with one additional commit since the last revision:
> 
>   another counter overflow

I'm still waiting on some tier10 tests that take 7 days to complete.

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PR Comment: https://git.openjdk.org/jdk/pull/14883#issuecomment-1641016106