6069aaee9c
Specifically, the case when not all parts of a multifile class are annotated with `@JvmSynthetic`. Report the error on the `@JvmMultifileClass` annotation instead of the package directive, because the latter is difficult to find via IR. This fixes the test FirLightTreeDiagnosticsTestWithJvmIrBackendGenerated.MultifileClasses.testJvmSynthetic. #KT-59586