Remove code supporting incremental compilation in dart2js

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.
 
 import '../common/backend_api.dart' show BackendClasses;
 import '../compiler.dart' show Compiler;
 import '../constants/constant_system.dart';
 import '../constants/values.dart';
 import '../elements/entities.dart';
 import '../js_backend/backend.dart';
@@ skipping 316 matching lines @@
                 new InterceptorConstantValue(interceptorClass), closedWorld);
             node.conditionalConstantInterceptor = constantInstruction;
             constantInstruction.usedBy.add(node);
             return false;
           }
         }
       }
     }
 
     // Try creating a one-shot interceptor or optimized is-check
-    if (compiler.options.hasIncrementalSupport) return false;
     if (node.usedBy.length != 1) return false;
     HInstruction user = node.usedBy.single;
 
     // If the interceptor [node] was loop hoisted, we keep the interceptor.
     if (!user.hasSameLoopHeaderAs(node)) return false;
 
     bool replaceUserWith(HInstruction replacement) {
       HBasicBlock block = user.block;
       block.addAfter(user, replacement);
       block.rewrite(user, replacement);
@@ skipping 75 matching lines @@
       instruction = new HInvokeDynamicMethod(
           selector, mask, inputs, node.instructionType, true);
     }
 
     HBasicBlock block = node.block;
     block.addAfter(node, instruction);
     block.rewrite(node, instruction);
     return true;
   }
 }