RFR: 8287227: Shenandoah: A couple of virtual thread tests failed with iu mode even without Loom enabled. [v2]

[Roland Westrelin]

> With JDK-8277654, the load barrier slow path call doesn't produce raw
> memory anymore but the IU barrier call still does. I propose removing
> raw memory for that call too which also causes the assert that fails
> to be removed.

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 four additional commits since the last revision:

 - new fix
 - Merge branch 'master' into JDK-8287227
 - Revert "fix"
   
   This reverts commit aa6f80a7883ee7032f81dbffac5d0257491d7118.
 - fix

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8958/files
  - new: https://git.openjdk.java.net/jdk/pull/8958/files/aa6f80a7..5699e042

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8958&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8958&range=00-01

  Stats: 54148 lines in 735 files changed: 28730 ins; 18849 del; 6569 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8958.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8958/head:pull/8958

PR: https://git.openjdk.java.net/jdk/pull/8958