RFR: Fix Windows aarch64 builds

[Aleksey Shipilev]

Current GHA point the problem with Windows aarch64 builds:
  https://github.com/shipilev/loom/runs/3721167733
 
It passes now:
  https://github.com/shipilev/loom/runs/3722819426

Additional testing:
 - [x] Windows aarch64 GHA builds fine
 - [x] Linux aarch64 `tier1_loom` still passes

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Commit messages:
 - More changes
 - Fixing GHA failures in Windows AArch64

Changes: https://git.openjdk.java.net/loom/pull/70/files
 Webrev: https://webrevs.openjdk.java.net/?repo=loom&pr=70&range=00
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/loom/pull/70.diff
  Fetch: git fetch https://git.openjdk.java.net/loom pull/70/head:pull/70

PR: https://git.openjdk.java.net/loom/pull/70