RFR: Revert non-const ref from leftover from prior change.

Tue Mar 15 00:58:06 UTC 2022

Minor remanent from prior change, and I fixed the other platforms while I was there.

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Commit messages:
 - Revert non-const ref from leftover from prior change.

Changes: https://git.openjdk.java.net/loom/pull/101/files
 Webrev: https://webrevs.openjdk.java.net/?repo=loom&pr=101&range=00
  Stats: 21 lines in 7 files changed: 0 ins; 8 del; 13 mod
  Patch: https://git.openjdk.java.net/loom/pull/101.diff
  Fetch: git fetch https://git.openjdk.java.net/loom pull/101/head:pull/101

PR: https://git.openjdk.java.net/loom/pull/101