[jdk21u-dev] RFR: 8321183: Incorrect warning from cds about the modules file

[Daniel Hu]

Clean backport. Improves CDS warning message about incorrect module file size. Passes GHA

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Commit messages:
 - Merge branch 'openjdk:master' into 8321183
 - Backport fd31f6a1663de0e06accdf015a71086346aa0d98

Changes: https://git.openjdk.org/jdk21u-dev/pull/2261/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2261&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8321183
  Stats: 30 lines in 5 files changed: 10 ins; 8 del; 12 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2261.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2261/head:pull/2261

PR: https://git.openjdk.org/jdk21u-dev/pull/2261