RFR: 8313564: Fix -Wconversion warnings in classfile code [v4]

[Dean Long]

On Thu, 3 Aug 2023 01:37:08 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:
> 
>   Fix Atomic items_added code.

src/hotspot/cpu/x86/vm_version_x86.cpp line 1808:

> 1806: 
> 1807:   // Allocation prefetch settings
> 1808:   int cache_line_size = checked_cast<int>(prefetch_data_size());

I don't see why the old code would produce a warning, except with -Wsign-conversion on 32-bit platforms.

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PR Review Comment: https://git.openjdk.org/jdk/pull/15111#discussion_r1283000602