RFR: 8370378: Some compiler tests inadvertently exclude particular platforms

Wed Oct 22 08:01:22 UTC 2025

As @dholmes-ora described in JBS: For historical reasons `os.arch` is `amd64` on x86_64 Linux and Windows, but `x86_64` on macOS. I fixed the tests accordingly.

Thanks,
Tobias

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Commit messages:
 - JDK-8370378

Changes: https://git.openjdk.org/jdk/pull/27931/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27931&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8370378
  Stats: 5 lines in 3 files changed: 0 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/27931.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27931/head:pull/27931

PR: https://git.openjdk.org/jdk/pull/27931