RFR: 8323815: Source launcher should find classes with $ in names [v2]

[Christian Stein]

> Please review this fix to make the multi-file source-code launcher find classes with `$` in names, including names of packages, names of compliation units, and also names of enclosed types.
> 
> Tested tier1-3

Christian Stein has updated the pull request incrementally with one additional commit since the last revision:

  Include more intere'$'ting compilation units

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Changes:
  - all: https://git.openjdk.org/jdk/pull/17526/files
  - new: https://git.openjdk.org/jdk/pull/17526/files/a8f92b90..38482e16

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17526&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17526&range=00-01

  Stats: 19 lines in 1 file changed: 19 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/17526.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17526/head:pull/17526

PR: https://git.openjdk.org/jdk/pull/17526