RFR: 7902764: RepGen: Javap mode doesn't support classes that have no package

[Leonid Kuskov]

This is the fix for https://bugs.openjdk.java.net/browse/CODETOOLS-7902764
It fixes the command jcov RepGen -javap classes -output out result-static.xml 
which does not produce a javap's colored output if java sources have no packages.

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Commit messages:
 - 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'
 - 7902796: Provide a "release" file for JCov builds
 - 7902783: Static instrumentation fails with Java 9 and above if multiple inputs are used
 - Merge remote-tracking branch 'upstream/master'
 - ... and 6 more: https://git.openjdk.java.net/jcov/compare/19a1a119...d39db79a

Changes: https://git.openjdk.java.net/jcov/pull/11/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jcov&pr=11&range=00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7902764
  Stats: 170 lines in 7 files changed: 48 ins; 33 del; 89 mod
  Patch: https://git.openjdk.java.net/jcov/pull/11.diff
  Fetch: git fetch https://git.openjdk.java.net/jcov pull/11/head:pull/11

PR: https://git.openjdk.java.net/jcov/pull/11