[master] RFR: Merge jdk:jdk-21+20 [v4]

[Thomas Stuefe]

> Merge jdk21+20

Thomas Stuefe has updated the pull request incrementally with two additional commits since the last revision:

 - compiler/loopopts/superword/TestIndependentPacksWithCyclicDependency.java
 - fix/workaround compiler/c2/irTests/TestVectorizationMismatchedAccess

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Changes:
  - all: https://git.openjdk.org/lilliput/pull/87/files
  - new: https://git.openjdk.org/lilliput/pull/87/files/a27f147b..e278ee30

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=lilliput&pr=87&range=03
 - incr: https://webrevs.openjdk.org/?repo=lilliput&pr=87&range=02-03

  Stats: 14 lines in 2 files changed: 12 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/lilliput/pull/87.diff
  Fetch: git fetch https://git.openjdk.org/lilliput.git pull/87/head:pull/87

PR: https://git.openjdk.org/lilliput/pull/87