[jdk21u-dev] RFR: 8343607: C2: Shenandoah crashes during barrier expansion in Continuation::enter [v2]

[Cesar Soares Lucas]

> Clean backport of this shenandoah c2 fix. We hit this bug in our (Amazon) internal CI system and also was reported by RedHat to happen on their CI as well.

Cesar Soares Lucas 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-JohnTortugo-45c914c3-master
 - Backport 45c914c3ad8fbc406af9ba9dec97f11c28c91299

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

Changes:
  - all: https://git.openjdk.org/jdk21u-dev/pull/2029/files
  - new: https://git.openjdk.org/jdk21u-dev/pull/2029/files/517fcfdc..0435e6e4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2029&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2029&range=00-01

  Stats: 5836 lines in 89 files changed: 2693 ins; 2854 del; 289 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2029.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2029/head:pull/2029

PR: https://git.openjdk.org/jdk21u-dev/pull/2029