NB Javac modules buildscripts
Issue #269467 - Editor does not show error with code that does not compile - fixed.
Issue #256966 - NullPointerException at com.sun.tools.javac.comp.Check.checkImportedPackagesObservable - fixed.
Issue #270308 - NullPointerException at com.sun.tools.javac.comp.Annotate.getAnnotationArrayValue - fixed.
Issue #271310 - NullPointerException at com.sun.tools.javac.comp.Attr.enclosingInitEnv - fixed.
Issue #271293 - Exception at com.sun.tools.javac.util.Log$DeferredDiagnosticHandler.reportDeferredDiagnostics - fixed.
Issue #271017 - AssertionError: isSubtype PACKAGE - fixed.
Issue #271053 - StringIndexOutOfBoundsException: String index out of range - fixed.
Issue #271211 - NullPointerException at com.sun.tools.javac.comp.Enter.lambda$visitTopLevel$1 - fixed.
Mergin jlahoda's fix of #8182450: javac aborts when generating ct.sym intermittently - Initialize the module system model even in presence of missing/broken module-infos; BadClassFiles should not immediatelly abort compilation anymore, but should be handled as if the classfile did not exist.