RFR: 8317012: Explicitly check for 32-bit word size for using libatomic with zero

[Erik Joelsson]

On Tue, 8 Apr 2025 15:17:40 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Comprehension check: we get bitness from arch itself somewhere earlier, right? `PLATFORM_EXTRACT_VARS_FROM_CPU` looks to be doing this.

Yes, that's correct.

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PR Comment: https://git.openjdk.org/jdk/pull/24515#issuecomment-2787148097