RFR: 8291649: multiple tests failing with -Xcomp after JDK-8290034 [v3]

[Jatin Bhateja]

> Hi,
> 
> This bug fix patch fixes the incorrect computation during constant folding of Reverse[IL] IR node.
> A new utility class has been added to optimize computation of reverse_bit operation using GCC built-ins.
> 
> 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:

  8291649: Incorporating code changes from Kim and John.

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/9987/files
  - new: https://git.openjdk.org/jdk/pull/9987/files/369bbd7a..629c584e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9987&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9987&range=01-02

  Stats: 232 lines in 3 files changed: 112 ins; 72 del; 48 mod
  Patch: https://git.openjdk.org/jdk/pull/9987.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9987/head:pull/9987

PR: https://git.openjdk.org/jdk/pull/9987