RFR: 8308975: Fix signed integer overflow in compiler code, part 2 [v3]

[Dean Long]

On Wed, 31 May 2023 00:23:01 GMT, Dean Long <dlong at openjdk.org> wrote:

>> This is a followup from part 1.  I had to use java_add/subtract/multiply/negate in a few more places.
>> cpu_loads_process had an overflow on BSD when the first snapshot is relative to the epoch in 1970.
>> Use unsigned for C2 Type hash functions.
>
> Dean Long has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fix potential -Werror=conversion issue

Thanks Andrew, Vladimir, and Coleen.

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PR Comment: https://git.openjdk.org/jdk/pull/14188#issuecomment-1570934231