RFR: 8313564: Fix -Wconversion warnings in classfile code [v2]

[Coleen Phillimore]

On Wed, 2 Aug 2023 13:40:12 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> This patch fixes various -Wconversion warnings in classfile code.  I broke the change into commits so the changes are easier to see.
>> Tested with tier1-4.
>
> Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Missed a case that gets -Wconversion warning for ContendedPaddingWidth.  prefetch_data_size() returns uint, so added a checked_cast<> to catch the case where it would return greater than signed int max.

Thanks for reviewing, David.  Reran with -Wconversion and now tier1 on your suggestions.

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PR Review: https://git.openjdk.org/jdk/pull/15111#pullrequestreview-1559985858