RFR: 8322077: Add Ideal transformation: (~a) | (~b) => ~(a & b) [v12]

[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 with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 18 additional commits since the last revision:

 - update copyright dates.
 - Merge branch 'andnode-PNewDeMorganLawAndToOr' into ornode-PNewDeMorganLawOrToAnd
 - Revert "adapt changes from the dependent pr."
   
   This reverts commit 0c8d10776fe55a28ea9f60160b4f6f57aabad5ab.
 - Revert "adapt to new changes from the dependant pr."
   
   This reverts commit b21e242b306d9cf01e1ba84ebba47ef5b471d98e.
 - adapt to new changes from the dependant pr.
 - Merge branch 'andnode-PNewDeMorganLawAndToOr' into ornode-PNewDeMorganLawOrToAnd
 - adapt changes from the dependent pr.
 - Merge branch 'andnode-PNewDeMorganLawAndToOr' into ornode-PNewDeMorganLawOrToAnd
 - 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>
 - ... and 8 more: https://git.openjdk.org/jdk/compare/8ab76889...dc60a548

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/16334/files
  - new: https://git.openjdk.org/jdk/pull/16334/files/b21e242b..dc60a548

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16334&range=11
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16334&range=10-11

  Stats: 23 lines in 5 files changed: 8 ins; 8 del; 7 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