dart2js: Allow 'throw' when inlining

sdk/lib/_internal/compiler/implementation/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.
 
 part of js_backend;
 
 typedef void Recompile(Element element);
 
 class ReturnInfo {
   HType returnType;
@@ skipping 1117 matching lines @@
   onResolutionComplete() => rti.computeClassesNeedingRti();
 
   void registerStringInterpolation(TreeElements elements) {
     enqueueInResolution(getStringInterpolationHelper(), elements);
   }
 
   void registerCatchStatement(TreeElements elements) {
     enqueueInResolution(getExceptionUnwrapper(), elements);
   }
 
-  void registerThrow(TreeElements elements) {
-    enqueueInResolution(getThrowHelper(), elements);
+  void registerWrapException(TreeElements elements) {
+    enqueueInResolution(getWrapExceptionHelper(), elements);
+  }
+
+  void registerThrowExpression(TreeElements elements) {
+    enqueueInResolution(getThrowExpressionHelper(), elements);
   }
 
   void registerLazyField(TreeElements elements) {
     enqueueInResolution(getCyclicThrowHelper(), elements);
   }
 
   void registerTypeLiteral(TreeElements elements) {
     enqueueInResolution(getCreateRuntimeType(), elements);
   }
 
@@ skipping 515 matching lines @@
 
   Element getThrowAbstractClassInstantiationError() {
     return compiler.findHelper(
         const SourceString('throwAbstractClassInstantiationError'));
   }
 
   Element getStringInterpolationHelper() {
     return compiler.findHelper(const SourceString('S'));
   }
 
-  Element getThrowHelper() {
-    return compiler.findHelper(const SourceString(r'$throw'));
+  Element getWrapExceptionHelper() {
+    return compiler.findHelper(const SourceString(r'wrapException'));
+  }
+
+  Element getThrowExpressionHelper() {
+    return compiler.findHelper(const SourceString('throwExpression'));
   }
 
   Element getClosureConverter() {
     return compiler.findHelper(const SourceString('convertDartClosureToJS'));
   }
 
   Element getTraceFromException() {
     return compiler.findHelper(const SourceString('getTraceFromException'));
   }
 
@@ skipping 70 matching lines @@
   ClassElement get constListImplementation => jsArrayClass;
   ClassElement get fixedListImplementation => jsFixedArrayClass;
   ClassElement get growableListImplementation => jsExtendableArrayClass;
   ClassElement get mapImplementation => mapLiteralClass;
   ClassElement get constMapImplementation => constMapLiteralClass;
   ClassElement get functionImplementation => jsFunctionClass;
   ClassElement get typeImplementation => typeLiteralClass;
   ClassElement get boolImplementation => jsBoolClass;
   ClassElement get nullImplementation => jsNullClass;
 }