Prevent inlining of js_library core.RegExp constructor

pkg/compiler/lib/src/js_backend/backend.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library js_backend.backend;
 
 import 'dart:async' show Future;
 
 import 'package:js_runtime/shared/embedded_names.dart' as embeddedNames;
 
@@ skipping 2472 matching lines @@
   }
 
   @override
   void onElementResolved(Element element) {
     if (element.isMalformed) {
       // Elements that are marker as malformed during parsing or resolution
       // might be registered here. These should just be ignored.
       return;
     }
 
-    if ((element.isFunction || element.isConstructor) &&
-        annotations.noInline(element)) {
-      inlineCache.markAsNonInlinable(element);
+    Element implementation = element.implementation;
+    if (element.isFunction || element.isConstructor) {
+      if (annotations.noInline(implementation)) {
+        inlineCache.markAsNonInlinable(implementation);
+      }
     }
 
     LibraryElement library = element.library;
     if (!library.isPlatformLibrary && !canLibraryUseNative(library)) return;
     bool hasNoInline = false;
     bool hasForceInline = false;
     bool hasNoThrows = false;
     bool hasNoSideEffects = false;
     for (MetadataAnnotation metadata in element.implementation.metadata) {
       metadata.ensureResolved(resolution);
@@ skipping 779 matching lines @@
   ClassElement get mapImplementation => helpers.mapLiteralClass;
   ClassElement get constMapImplementation => helpers.constMapLiteralClass;
   ClassElement get typeImplementation => helpers.typeLiteralClass;
   ClassElement get boolImplementation => helpers.jsBoolClass;
   ClassElement get nullImplementation => helpers.jsNullClass;
   ClassElement get syncStarIterableImplementation => helpers.syncStarIterable;
   ClassElement get asyncFutureImplementation => helpers.futureImplementation;
   ClassElement get asyncStarStreamImplementation => helpers.controllerStream;
   ClassElement get functionImplementation => helpers.coreClasses.functionClass;
 }