Incremental compiler: support optional arguments.

dart/pkg/compiler/lib/src/ssa/interceptor_simplifier.dart

 // Copyright (c) 2013, 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 ssa;
 
 /**
  * This phase simplifies interceptors in multiple ways:
  *
  * 1) If the interceptor is for an object whose type is known, it
@@ skipping 237 matching lines @@
     HInstruction constantInterceptor =
         tryComputeConstantInterceptor(receiver, interceptedClasses);
     if (constantInterceptor != null) {
       node.block.rewrite(node, constantInterceptor);
       return false;
     }
 
     node.interceptedClasses = interceptedClasses;
 
     // Try creating a one-shot interceptor.
+    if (compiler.hasIncrementalSupport) return false;
     if (node.usedBy.length != 1) return false;
     if (node.usedBy[0] is !HInvokeDynamic) return false;
 
     HInvokeDynamic user = node.usedBy[0];
 
     // If [node] was loop hoisted, we keep the interceptor.
     if (!user.hasSameLoopHeaderAs(node)) return false;
 
     // Replace the user with a [HOneShotInterceptor].
     HConstant nullConstant = graph.addConstantNull(compiler);
@@ skipping 53 matching lines @@
       instruction = new HInvokeDynamicMethod(
           selector, inputs, node.instructionType, true);
     }
 
     HBasicBlock block = node.block;
     block.addAfter(node, instruction);
     block.rewrite(node, instruction);
     return true;
   }
 }