[jdk16u] RFR: 8262295: C2: Out-of-Bounds Array Load from Clone Source

[Richard Reingruber]

This is the jdk16u backport of the fix for JDK-8262295.
The fix applies cleanly.
The test required trivial adaptation: I had to remove the package from the class ClassFileInstaller.

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Commit messages:
 - Remove package from ClassFileInstaller in regression test.
 - Backport 9689863ac0bac8c542162d4af30fec078e9c91b4

Changes: https://git.openjdk.java.net/jdk16u/pull/101/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk16u&pr=101&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8262295
  Stats: 120 lines in 2 files changed: 119 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk16u/pull/101.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk16u pull/101/head:pull/101

PR: https://git.openjdk.java.net/jdk16u/pull/101