RFR: JDK-8317693: Unused parameter to Tokens.Token.comment method

[Jonathan Gibbons]

Please review a simple cleanup to eliminate an unused parameter and rename the enclosing method.

No new tests; bug is primarily `noreg-cleanup`. Two tests were affected by the change, but are not in themselves tests for the change.

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Commit messages:
 - JDK-8317693: Unused parameter to Tokens.Token.comment method

Changes: https://git.openjdk.org/jdk/pull/16088/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16088&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8317693
  Stats: 26 lines in 5 files changed: 0 ins; 2 del; 24 mod
  Patch: https://git.openjdk.org/jdk/pull/16088.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16088/head:pull/16088

PR: https://git.openjdk.org/jdk/pull/16088