Fix a performance regressions introduced by r10632.

lib/compiler/implementation/elements/elements.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('elements');
 
 #import('dart:uri');
 
 #import('../tree/tree.dart');
 #import('../scanner/scannerlib.dart');
@@ skipping 818 matching lines @@
   void setPatch(FunctionElement patchElement) {
     // Sanity checks. The caller must check these things before calling.
     assert(patch === null);
     assert(cachedNode === null);
     this.patch = patchElement;
     cachedNode = patchElement.cachedNode;
   }
 
   bool isInstanceMember() {
     return isMember()
-           && kind != ElementKind.GENERATIVE_CONSTRUCTOR
-           && !modifiers.isFactory()
+           && !isConstructor()
            && !modifiers.isStatic();
   }
 
   FunctionSignature computeSignature(Compiler compiler) {
     if (functionSignature !== null) return functionSignature;
     compiler.withCurrentElement(this, () {
       functionSignature = compiler.resolveSignature(this);
     });
     return functionSignature;
   }
@@ skipping 628 matching lines @@
   Node parseNode(compiler) => cachedNode;
 
   String toString() => "${enclosingElement.toString()}.${name.slowToString()}";
 
   TypeVariableElement cloneTo(Element enclosing, DiagnosticListener listener) {
     TypeVariableElement result =
         new TypeVariableElement(name, enclosing, node, type, bound);
     return result;
   }
 }