[lworld] RFR: 8336682: [lworld] java/lang/instrument/IsModifiableClassAgent.java test fails when run with migrates classes

[Coleen Phillimore]

The test uses the class file reconstituter to provide the redefined bytecodes, leaving out the LoadableDescriptors.  Adding them to the reconsistituted class file makes the test pass, also fix the verification code since these descriptors are utf8s now.  Tested with java/lang/instrument with --enable-preview.  Should write a test but I don't know how.

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Commit messages:
 - 8336682: [lworld] java/lang/instrument/IsModifiableClassAgent.java test fails when run with migrates classes

Changes: https://git.openjdk.org/valhalla/pull/1172/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1172&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8336682
  Stats: 45 lines in 4 files changed: 32 ins; 0 del; 13 mod
  Patch: https://git.openjdk.org/valhalla/pull/1172.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1172/head:pull/1172

PR: https://git.openjdk.org/valhalla/pull/1172