JS backend: report diagnostic when try to get referenece on builtin members instead of crash with Exception.

js/js.frontend/src/org/jetbrains/kotlin/js/resolve/diagnostics/DefaultErrorMessagesJs.kt

@@ -35,6 +35,7 @@ private val DIAGNOSTIC_FACTORY_TO_RENDERER by Delegates.lazy {
         put(ErrorsJs.JSCODE_WARNING, "JavaScript: {0}", JsCallDataTextRenderer)
         put(ErrorsJs.JSCODE_ARGUMENT_SHOULD_BE_CONSTANT, "Argument must be string constant")
         put(ErrorsJs.NOT_SUPPORTED, "Cannot translate (not supported yet): ''{0}''", RenderFirstLineOfElementText)
+        put(ErrorsJs.REFERENCE_TO_BUILTIN_MEMBERS_NOT_SUPPORTED, "Callable references for builtin members are not supported yet: ''{0}''", RenderFirstLineOfElementText)
 
 
         this

js/js.frontend/src/org/jetbrains/kotlin/js/resolve/diagnostics/ErrorsJs.java

@@ -40,6 +40,7 @@ public interface ErrorsJs {
     DiagnosticFactory1<JetExpression, JsCallData> JSCODE_WARNING = DiagnosticFactory1.create(WARNING, JsCodePositioningStrategy.INSTANCE$);
     DiagnosticFactory0<JetExpression> JSCODE_ARGUMENT_SHOULD_BE_CONSTANT = DiagnosticFactory0.create(ERROR, DEFAULT);
     DiagnosticFactory1<JetElement, JetElement> NOT_SUPPORTED = DiagnosticFactory1.create(ERROR, DEFAULT);
+    DiagnosticFactory1<JetElement, JetElement> REFERENCE_TO_BUILTIN_MEMBERS_NOT_SUPPORTED = DiagnosticFactory1.create(ERROR, DEFAULT);
 
     @SuppressWarnings("UnusedDeclaration")
     Object _initializer = new Object() {