[jdk17u-dev] RFR: 8299970: Speed up compiler/arraycopy/TestArrayCopyConjoint.java

[Victor Rudometov]

Backport for https://bugs.openjdk.org/browse/JDK-8299970

Clean backport, test update, low risk
Test passes

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Commit messages:
 - Backport 5d39d14522df5dc35a5f4c9934d2cf8da4fecaa6

Changes: https://git.openjdk.org/jdk17u-dev/pull/1178/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1178&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8299970
  Stats: 28 lines in 2 files changed: 0 ins; 10 del; 18 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1178.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/1178/head:pull/1178

PR: https://git.openjdk.org/jdk17u-dev/pull/1178