[jdk21u] RFR: 8311923: TestIRMatching.java fails on RISC-V

[Gui Cao]

8311923: TestIRMatching.java fails on RISC-V

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Commit messages:
 - Backport e7adbdb1f1506b82392907f7e4a5c8882d3198eb

Changes: https://git.openjdk.org/jdk21u/pull/12/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=12&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8311923
  Stats: 11 lines in 2 files changed: 0 ins; 0 del; 11 mod
  Patch: https://git.openjdk.org/jdk21u/pull/12.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/12/head:pull/12

PR: https://git.openjdk.org/jdk21u/pull/12