[jdk18u] RFR: 8277893: Arraycopy stress tests [v2]

[Aleksey Shipilev]

> Clean backport to improve testing.
> 
> Additional testing:
>  - [x] Linux x86_64 fastdebug passes `hotspot_compiler_arraycopy`

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-8277893-arraycopy-stress-tests
 - Backport 29bd73638a22d341767a1266723a7d7263e17093

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

Changes:
  - all: https://git.openjdk.java.net/jdk18u/pull/44/files
  - new: https://git.openjdk.java.net/jdk18u/pull/44/files/2064acfc..15543921

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk18u&pr=44&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk18u&pr=44&range=00-01

  Stats: 257 lines in 9 files changed: 227 ins; 5 del; 25 mod
  Patch: https://git.openjdk.java.net/jdk18u/pull/44.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk18u pull/44/head:pull/44

PR: https://git.openjdk.java.net/jdk18u/pull/44