[jdk17u-dev] RFR: 8294281: Allow warnings to be disabled on a per-file basis

[Dan Lutker]

Required by https://github.com/openjdk/jdk17u-dev/pull/1231

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Commit messages:
 - Backport e45f3d5176e4affaa08480b560ca983fdbcb2846

Changes: https://git.openjdk.org/jdk17u-dev/pull/1232/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1232&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8294281
  Stats: 7 lines in 1 file changed: 5 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1232.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1232/head:pull/1232

PR: https://git.openjdk.org/jdk17u-dev/pull/1232