[jdk17u] RFR: 8271925: ZGC: Arraycopy stub passes invalid oop to load barrier

[Tobias Hartmann]

Backport of [JDK-8271925](https://bugs.openjdk.java.net/browse/JDK-8271925). Applies cleanly.

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Commit messages:
 - 8271925: ZGC: Arraycopy stub passes invalid oop to load barrier

Changes: https://git.openjdk.java.net/jdk17u/pull/15/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u&pr=15&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8271925
  Stats: 9 lines in 1 file changed: 3 ins; 0 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk17u/pull/15.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u pull/15/head:pull/15

PR: https://git.openjdk.java.net/jdk17u/pull/15