RFR: 8283894: Intrinsify compress and expand bits on x86

[Paul Sandoz]

On Mon, 2 May 2022 08:19:53 GMT, Jatin Bhateja <jbhateja at openjdk.org> wrote:

> Summary of changes:
> 
> - Patch intrinsifies following newly added Java SE APIs
>   - Integer.compress
>   - Integer.expand
>   - Long.compress
>   - Long.expand
>   
> - Adds C2 IR nodes and corresponding ideal transformations for new operations.
> - We see around ~10x performance speedup due to intrinsification over X86 target. 
> - Adds an IR framework based test to validate newly introduced IR transformations.
> 
> Kindly review and share your feedback.
> 
> Best Regards,
> Jatin

Can you update the jtreg tests:
1. Modify `CompressExpandTest` to run with and without the intrinsic enabled
2. Disable  (by default) `CompressExpandSanityTest`
?

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PR: https://git.openjdk.java.net/jdk/pull/8498