Use module path instead of class path for stdlib on Java 9

Also report the "named does not read unnamed" error, which was not
possible previously because we wouldn't be able to read anything from
kotlin-stdlib (because it was added to the unnamed module by default)

compiler/frontend.java/src/org/jetbrains/kotlin/resolve/jvm/checkers/JvmModuleAccessibilityChecker.kt

@@ -68,9 +68,7 @@ class JvmModuleAccessibilityChecker(project: Project) : CallChecker {
 
         return when (diagnostic) {
             is ModuleDoesNotReadUnnamedModule ->
-                // TODO: report this error as soon as module path is used instead of class path for modular compilation
-                // JAVA_MODULE_DOES_NOT_READ_UNNAMED_MODULE.on(reportOn)
-                null
+                JAVA_MODULE_DOES_NOT_READ_UNNAMED_MODULE.on(reportOn)
             is ModuleDoesNotReadModule ->
                 JAVA_MODULE_DOES_NOT_DEPEND_ON_MODULE.on(reportOn, diagnostic.dependencyModuleName)
             is ModuleDoesNotExportPackage ->

compiler/frontend.java/src/org/jetbrains/kotlin/resolve/jvm/modules/JavaModuleInfo.kt

@@ -74,7 +74,8 @@ class JavaModuleInfo(
                         }
 
                         override fun visitExport(packageFqName: String, access: Int, modules: Array<String>?) {
-                            exports.add(Exports(FqName(packageFqName), modules?.toList().orEmpty()))
+                            // For some reason, '/' is the delimiter in packageFqName here
+                            exports.add(Exports(FqName(packageFqName.replace('/', '.')), modules?.toList().orEmpty()))
                         }
                     }
                 }