[jdk21u-dev] RFR: 8326638: Crash in PhaseIdealLoop::remix_address_expressions due to unexpected Region instead of Loop [v2]

[Andrew Lu]

> I backport this for parity with 21.0.3-oracle.

Andrew Lu 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 two additional commits since the last revision:

 - Merge branch 'openjdk:master' into backport-luchenlin-9f0e7da6
 - Backport 9f0e7da64e21237322e55ca4f0e3639fa5d1c4ed

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

Changes:
  - all: https://git.openjdk.org/jdk21u-dev/pull/317/files
  - new: https://git.openjdk.org/jdk21u-dev/pull/317/files/f02b664f..859915b0

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=317&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=317&range=00-01

  Stats: 316 lines in 16 files changed: 282 ins; 7 del; 27 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/317.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/317/head:pull/317

PR: https://git.openjdk.org/jdk21u-dev/pull/317