RFR: Freeze funcs

[Robbin Ehn]

Once again.

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Commit messages:
 - Freeze funcs

Changes: https://git.openjdk.java.net/loom/pull/164/files
 Webrev: https://webrevs.openjdk.java.net/?repo=loom&pr=164&range=00
  Stats: 253 lines in 2 files changed: 88 ins; 83 del; 82 mod
  Patch: https://git.openjdk.java.net/loom/pull/164.diff
  Fetch: git fetch https://git.openjdk.java.net/loom pull/164/head:pull/164

PR: https://git.openjdk.java.net/loom/pull/164