Fix issue 4639

lib/compiler/implementation/ssa/nodes.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.
 
 interface HVisitor<R> {
   R visitAdd(HAdd node);
   R visitBailoutTarget(HBailoutTarget node);
   R visitBitAnd(HBitAnd node);
   R visitBitNot(HBitNot node);
   R visitBitOr(HBitOr node);
@@ skipping 1237 matching lines @@
 }
 
 class HInvokeDynamicSetter extends HInvokeDynamicField {
   HInvokeDynamicSetter(selector, element, receiver, value)
     : super(selector, element, [receiver, value]);
   toString() => 'invoke dynamic setter: $selector';
   accept(HVisitor visitor) => visitor.visitInvokeDynamicSetter(this);
 }
 
 class HInvokeStatic extends HInvoke {
+  static final int INVOKE_INTERCEPTOR_TYPECODE = 4;
   static final int INVOKE_STATIC_TYPECODE = 30;
 
   /** The first input must be the target. */
   HInvokeStatic(inputs, [HType knownType = HType.UNKNOWN]) : super(inputs) {
     guaranteedType = knownType;
   }
 
   toString() => 'invoke static: ${element.name}';
   accept(HVisitor visitor) => visitor.visitInvokeStatic(this);
   int typeCode() => INVOKE_STATIC_TYPECODE;
@@ skipping 78 matching lines @@
   void prepareGvn(HTypeMap types) {
     if (isLengthGetterOnStringOrArray(types)) {
       setUseGvn();
       clearAllSideEffects();
       setDependsOnSomething();
     } else {
       setAllSideEffects();
     }
   }
 
-  int typeCode() => 4;
+  int typeCode() => HInvokeStatic.INVOKE_INTERCEPTOR_TYPECODE;
   bool typeEquals(other) => other is HInvokeInterceptor;
   bool dataEquals(HInvokeInterceptor other) {
     return getter == other.getter && name == other.name;
   }
 }
 
 abstract class HFieldAccess extends HInstruction {
   final Element element;
   final SourceString fieldName;
   final LibraryElement library;
@@ skipping 1419 matching lines @@
   HBasicBlock get start => expression.start;
   HBasicBlock get end {
     // We don't create a switch block if there are no cases.
     assert(!statements.isEmpty());
     return statements.last().end;
   }
 
   bool accept(HStatementInformationVisitor visitor) =>
       visitor.visitSwitchInfo(this);
 }