[jdk16u] RFR: 8259777: Incorrect predication condition generated by ADLC

[Tobias Hartmann]

Backport of [JDK-8259777](https://bugs.openjdk.java.net/browse/JDK-8259777). Applies cleanly.

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Commit messages:
 - 8259777: Incorrect predication condition generated by ADLC

Changes: https://git.openjdk.java.net/jdk16u/pull/14/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk16u&pr=14&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8259777
  Stats: 26 lines in 2 files changed: 15 ins; 0 del; 11 mod
  Patch: https://git.openjdk.java.net/jdk16u/pull/14.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk16u pull/14/head:pull/14

PR: https://git.openjdk.java.net/jdk16u/pull/14