[jdk17u-dev] RFR: 8311923: TestIRMatching.java fails on RISC-V

[Gui Cao]

Hi, I would like to backport this to jdk17u-dev to make TestIRMatching.java test work on Linux RISC-V platform.
The backport is not clean because jdk17u-dev has no [JDK-8280378](https://bugs.openjdk.org/browse/JDK-8280378) `test/hotspot/jtreg/testlibrary_tests/ir_framework/tests/TestIRMatching.java` passed with fastdebug build using unmatched board.

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Commit messages:
 - 8311923: TestIRMatching.java fails on RISC-V

Changes: https://git.openjdk.org/jdk17u-dev/pull/1611/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1611&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/jdk17u-dev/pull/1611.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1611/head:pull/1611

PR: https://git.openjdk.org/jdk17u-dev/pull/1611