[jdk20] RFR: 8298162: Test PrintClasses hits assert when run with code that retransform classes [v2]

[Coleen Phillimore]

> Allow scratch class to print InstanceKlass fields and not crash.  We might enhance InstanceKlass::print_on() to print more of the misc_flags information in the future so this output (rarely seen) doesn't confuse people.
> Tested with failing test case, and tier1-4.

Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:

  Add requires vm.hasJFR

-------------

Changes:
  - all: https://git.openjdk.org/jdk20/pull/57/files
  - new: https://git.openjdk.org/jdk20/pull/57/files/d64edd47..404b5304

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk20&pr=57&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk20&pr=57&range=00-01

  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk20/pull/57.diff
  Fetch: git fetch https://git.openjdk.org/jdk20 pull/57/head:pull/57

PR: https://git.openjdk.org/jdk20/pull/57