[jdk11u-dev] RFR: 8223923: C2: Missing interference with mismatched unsafe accesses [v2]

[Aleksey Shipilev]

> Clean backport to fix C2 bug.
> 
> Additional testing:
>  - [x] New test fails without the C2 fix, passes with it
>  - [x] Linux x86_64 tier1 passes with the fix

Aleksey Shipilev 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 JDK-8223923
 - Backport 86add21a85ec57de00aecb0a18bc99567a91d0d8

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

Changes:
  - all: https://git.openjdk.java.net/jdk11u-dev/pull/276/files
  - new: https://git.openjdk.java.net/jdk11u-dev/pull/276/files/05d4154b..3b35f191

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=276&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=276&range=00-01

  Stats: 26244 lines in 847 files changed: 11293 ins; 11699 del; 3252 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/276.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/276/head:pull/276

PR: https://git.openjdk.java.net/jdk11u-dev/pull/276