RFR: 8283894: Intrinsify compress and expand bits on x86 [v3]

[Jatin Bhateja]

> 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

Jatin Bhateja has updated the pull request incrementally with one additional commit since the last revision:

  8283894: Add missing -XX:+UnlockDiagnosticVMOptions.

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8498/files
  - new: https://git.openjdk.java.net/jdk/pull/8498/files/f7ed0f8d..93aa5e2d

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8498&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8498&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8498.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8498/head:pull/8498

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