RFR: 8367368: Add message for verify_legal_class_modifiers for inner classes [v5]

[Coleen Phillimore]

> This adds the inner class name (or unnamed) to the error message for invalid inner class modifiers.
> Testing with tier1-4.

Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:

  Only test for message fragments - Chen's comments.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/27201/files
  - new: https://git.openjdk.org/jdk/pull/27201/files/a8e655a4..c6467742

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27201&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27201&range=03-04

  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/27201.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27201/head:pull/27201

PR: https://git.openjdk.org/jdk/pull/27201