RFR: 8322077: Add Ideal transformation: (~a) | (~b) => ~(a & b) [v9]

[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#L1617C28-L1617C28); 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 two additional commits since the last revision:

 - Update test/hotspot/jtreg/compiler/c2/irTests/DeMorganLawLongTests.java
   
   Co-authored-by: Tobias Hartmann <tobias.hartmann at oracle.com>
 - Update test/hotspot/jtreg/compiler/c2/irTests/DeMorganLawIntTests.java
   
   Co-authored-by: Tobias Hartmann <tobias.hartmann at oracle.com>

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/16334/files
  - new: https://git.openjdk.org/jdk/pull/16334/files/d8ed0f35..6eb29aef

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16334&range=08
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16334&range=07-08

  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/16334.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16334/head:pull/16334

PR: https://git.openjdk.org/jdk/pull/16334