Add operators test to source_mapping_test.

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

 // Copyright (c) 2014, 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 code_generator;
 
 import 'glue.dart';
 
 import '../../tree_ir/tree_ir_nodes.dart' as tree_ir;
 import '../../tree_ir/tree_ir_nodes.dart' show BuiltinOperator;
@@ skipping 627 matching lines @@
         <js.Expression>[name, internalName, kind, arguments, argumentNames]);
   }
 
   @override
   js.Expression visitInterceptor(tree_ir.Interceptor node) {
     glue.registerUseInterceptorInCodegen();
     registry.registerSpecializedGetInterceptor(node.interceptedClasses);
     js.Name helperName = glue.getInterceptorName(node.interceptedClasses);
     js.Expression globalHolder = glue.getInterceptorLibrary();
     return js.js('#.#(#)',
-        [globalHolder, helperName, visitExpression(node.input)]);
+        [globalHolder, helperName, visitExpression(node.input)])
+            .withSourceInformation(node.sourceInformation);
   }
 
   @override
   js.Expression visitGetField(tree_ir.GetField node) {
     registry.registerFieldGetter(node.field);
     return new js.PropertyAccess(
         visitExpression(node.object),
         glue.instanceFieldPropertyName(node.field));
   }
 
@@ skipping 166 matching lines @@
         return js.js("typeof # === 'number' && Math.floor(#) === #", args);
     }
   }
 
   visitFunctionExpression(tree_ir.FunctionExpression node) {
     // FunctionExpressions are currently unused.
     // We might need them if we want to emit raw JS nested functions.
     throw 'FunctionExpressions should not be used';
   }
 }