RFR: 7902876: Cleanup Instr tool [v2]

[Leonid Kuskov]

> This is the fix for https://bugs.openjdk.java.net/browse/CODETOOLS-7902876
> The update fixes the following
> 1. usage of methods in utests should be downgraded to JDK 8
> 2. spelling errors and malformed comments
> 3. javap regression
> 4. jcov should be switched from 9.0.1 snapshot to 9.1 (JDK 17 is supported)
> 5. deprecated methods should be refactored

Leonid Kuskov has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 19 commits:

 - Merge branch 'master' into CODETOOLS-7902876
 - 7902876: Cleanup Instr tool
 - Instrumentation plugin concept
   
   Reviewed-by: lkuskov
 - 7902764: RepGen: Javap mode doesn't support classes that have no package
 - 7902724: jcov ignores covariant method overriding while gathering a methods coverages
 - Merge remote-tracking branch 'upstream/master'
 - 7902819: jcov fails to instrument JDKs records
 - Merge branch 'master' into CODETOOLS-7902823
 - 7902823: RepGen fails with IllegalFormatArgumentIndexException if started by JDK 16 and above
 - Merge remote-tracking branch 'upstream/master'
 - ... and 9 more: https://git.openjdk.java.net/jcov/compare/8deab262...a7ee41e7

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Changes: https://git.openjdk.java.net/jcov/pull/12/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jcov&pr=12&range=01
  Stats: 339 lines in 12 files changed: 137 ins; 62 del; 140 mod
  Patch: https://git.openjdk.java.net/jcov/pull/12.diff
  Fetch: git fetch https://git.openjdk.java.net/jcov pull/12/head:pull/12

PR: https://git.openjdk.java.net/jcov/pull/12