[jdk17u-dev] RFR: 8311923: TestIRMatching.java fails on RISC-V [v2]

[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.

Gui Cao has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge branch 'master' into backport-JDK-8311923
 - 8311923: TestIRMatching.java fails on RISC-V

-------------

Changes:
  - all: https://git.openjdk.org/jdk17u-dev/pull/1611/files
  - new: https://git.openjdk.org/jdk17u-dev/pull/1611/files/e0d0b686..232ade13

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1611&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1611&range=00-01

  Stats: 3854 lines in 296 files changed: 1800 ins; 726 del; 1328 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