RFR: 8283894: Intrinsify compress and expand bits on x86 [v4]

[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: Review comments resolved.

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8498/files
  - new: https://git.openjdk.java.net/jdk/pull/8498/files/93aa5e2d..1cbb353a

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8498&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8498&range=02-03

  Stats: 154 lines in 4 files changed: 63 ins; 46 del; 45 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