In most affected tests, the backend diagnostic such as "conflicting JVM
signature" or "accidental override" is directly caused by some already
existing error reported by frontend, so it doesn't make sense to check
backend diagnostics there.
Tests where that was not the case were moved/copied to
`testsWithJvmBackend`.
This diagnostic is reported on an explicitly-declared function which
overrides a regular Java function with the same signature as a hidden
one from the same scope.
#KT-64846 Fixed
Alexander Udalov