[jdk18u] RFR: 8280526: x86_32 Math.sqrt performance regression with -XX:UseSSE={0,1}

[Aleksey Shipilev]

On Wed, 26 Jan 2022 10:38:12 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Clean backport to fix the recent regression.
> 
> Additional testing:
>  - [x] `compiler/loopopts/superword/SumRedSqrt_Double.java` does not timeout anymore

Got the push approval.

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PR: https://git.openjdk.java.net/jdk18u/pull/9