[jdk17u-dev] RFR: 8358334: C2/Shenandoah: incorrect execution with Unsafe [v2]

[Roland Westrelin]

> 21u patch doesn't apply cleanly but only because some code that's
> replaced still uses `NULL` instead of `nullptr`. Otherwise, patch is
> identical to 21u patch.
> 
> Tested with hotspot_gc_shenandoah + tier1 with -XX:+UseShenandoahGC

Roland Westrelin 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 'master' into backport-rwestrel-23069e91-master
 - Backport 23069e9163c4d416aa9861bc0c7beb37a71dbfa7

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

Changes:
  - all: https://git.openjdk.org/jdk17u-dev/pull/3770/files
  - new: https://git.openjdk.org/jdk17u-dev/pull/3770/files/74fc45fe..dd0a96f2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3770&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3770&range=00-01

  Stats: 34678 lines in 479 files changed: 22028 ins; 10137 del; 2513 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3770.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3770/head:pull/3770

PR: https://git.openjdk.org/jdk17u-dev/pull/3770