[lworld] RFR: Merge jdk [v3]

[David Simms]

> Merge tag 'jdk-20+20' into lworld_merge_jdk_20_20

David Simms has updated the pull request incrementally with one additional commit since the last revision:

  Compile issue, explicit tmp regs to load_oop_heap

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Changes:
  - all: https://git.openjdk.org/valhalla/pull/800/files
  - new: https://git.openjdk.org/valhalla/pull/800/files/e44f8550..1f0af2a2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=valhalla&pr=800&range=02
 - incr: https://webrevs.openjdk.org/?repo=valhalla&pr=800&range=01-02

  Stats: 9 lines in 3 files changed: 0 ins; 0 del; 9 mod
  Patch: https://git.openjdk.org/valhalla/pull/800.diff
  Fetch: git fetch https://git.openjdk.org/valhalla pull/800/head:pull/800

PR: https://git.openjdk.org/valhalla/pull/800