The tests serviceability/jvmti/RedefineClasses start failing in loom-repo with CNFE like "java.lang.NoClassDefFoundError: jdk/test/lib/compiler/InMemoryJavaCompiler"

It is not a loom specific bug, it might happen in jdk/jdk also.

The workaround is to build some classes explicitly. The fix was implemented in repo-loom in Nov 2021 and there was no such failure after the fix in the loom repo.

Also fix inlcudes some text refactoring to make push from loom smaller.