RFR: 7903093: Detect invalid class names in CleanAction [v2]

[Christian Stein]

> Check the validity of all given class names by delegating the check to the `javax.lang.model.SourceVersion#isName` method.

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

  Allow special name marker and pattern

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Changes:
  - all: https://git.openjdk.java.net/jtreg/pull/53/files
  - new: https://git.openjdk.java.net/jtreg/pull/53/files/6eb46cd0..936959a7

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jtreg&pr=53&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jtreg&pr=53&range=00-01

  Stats: 7 lines in 1 file changed: 4 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jtreg/pull/53.diff
  Fetch: git fetch https://git.openjdk.java.net/jtreg pull/53/head:pull/53

PR: https://git.openjdk.java.net/jtreg/pull/53