RFR: 8322985: [BACKOUT] 8318562: Computational test more than 2x slower when AVX instructions are used

[Christian Hagedorn]

On Fri, 5 Jan 2024 13:41:51 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

> [JDK-8318562](https://bugs.openjdk.org/browse/JDK-8318562) broke implicit null checking for cvt instructions. See JBS for details. Let's back it out for now because this is a potential showstopper for JDK 17.0.11, 21.0.2 and 22 and needs to be backported asap.
> 
> The backout applies cleanly.
> 
> Thanks,
> Tobias

Sounds reasonable, backout looks good.

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Marked as reviewed by chagedorn (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/17279#pullrequestreview-1805997423