RFR: 8321542: C2: Missing ChaCha20 stub for x86_32 leads to crashes

[Aleksey Shipilev]

On Tue, 12 Dec 2023 01:02:59 GMT, Jamil Nimeh <jnimeh at openjdk.org> wrote:

> This fix corrects an oversight in the ChaCha20 intrinsics delivered by JDK-8247645.  An ifdef guard is now part of the x86 ChaCha20 intrinsics code which disables them by default on 32-bit platforms, as this architecture was not part of the feature delivery.

Agreed with message suggestion, otherwise good.

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Marked as reviewed by shade (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/17072#pullrequestreview-1777014512