RFR: 8322589: Add Ideal transformation: (~a) & (~b) => ~(a | b) [v8]

[Zhiqiang Zang]

> Hello,
> 
> `(~a) & (~b) => ~(a | b)` is a widely seen pattern, for example it is implemented for LLVM [here](https://github.com/llvm/llvm-project/blob/397f1ce9efb4eea1ee10fe4833f733b8c7abd878/llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp#L1616C28-L1616C28); however it is missing in current implementation of hotspot. This pull request adds this transformation and associated tests.
> 
> Thanks.

Zhiqiang Zang has updated the pull request incrementally with one additional commit since the last revision:

  move the two helper functions to member functions of the node class.

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/16333/files
  - new: https://git.openjdk.org/jdk/pull/16333/files/c4fa2e40..7a962d69

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16333&range=07
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16333&range=06-07

  Stats: 53 lines in 5 files changed: 24 ins; 23 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/16333.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16333/head:pull/16333

PR: https://git.openjdk.org/jdk/pull/16333