RFR: 8322077: Add Ideal transformation: (~a) | (~b) => ~(a & b) [v10]

[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 12 additional commits since the last revision:

 - 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>
 - Add tests for using De Morgan's Law for both optimizations.
 - remove unused code from tests.
 - update the copyright dates.
 - address comments.
 - untabify.
 - use common helpful functions.
 - ... and 2 more: https://git.openjdk.org/jdk/compare/9fcae094...0c8d1077

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/16334/files
  - new: https://git.openjdk.org/jdk/pull/16334/files/6eb29aef..0c8d1077

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16334&range=09
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16334&range=08-09

  Stats: 60 lines in 5 files changed: 24 ins; 23 del; 13 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