Enable GVN on HForeignNew

pkg/compiler/lib/src/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.
 
 import '../closure.dart';
 import '../common.dart';
 import '../compiler.dart' show Compiler;
 import '../constants/constant_system.dart';
 import '../constants/values.dart';
 import '../dart_types.dart';
@@ skipping 855 matching lines @@
   static const int VOID_TYPE_TYPECODE = 33;
   static const int INTERFACE_TYPE_TYPECODE = 34;
   static const int DYNAMIC_TYPE_TYPECODE = 35;
   static const int TRUNCATING_DIVIDE_TYPECODE = 36;
   static const int IS_VIA_INTERCEPTOR_TYPECODE = 37;
 
   static const int TYPE_INFO_READ_RAW_TYPECODE = 38;
   static const int TYPE_INFO_READ_VARIABLE_TYPECODE = 39;
   static const int TYPE_INFO_EXPRESSION_TYPECODE = 40;
 
+  static const int FOREIGN_CODE_TYPECODE = 41;
+
   HInstruction(this.inputs, this.instructionType)
       : id = idCounter++,
         usedBy = <HInstruction>[] {
     assert(inputs.every((e) => e != null));
   }
 
   int get hashCode => id;
 
   bool useGvn() => _useGvn;
   void setUseGvn() {
@@ skipping 1008 matching lines @@
       effects = nativeBehavior.sideEffects;
     }
     if (this.throwBehavior == null) {
       this.throwBehavior = (nativeBehavior == null)
           ? native.NativeThrowBehavior.MAY
           : nativeBehavior.throwBehavior;
     }
     assert(this.throwBehavior != null);
 
     if (effects != null) sideEffects.add(effects);
+    if (nativeBehavior != null && nativeBehavior.useGvn) {
+      setUseGvn();
+    }
   }
 
   HForeignCode.statement(js.Template codeTemplate, List<HInstruction> inputs,
       SideEffects effects, native.NativeBehavior nativeBehavior, TypeMask type)
       : this(codeTemplate, type, inputs,
             isStatement: true,
             effects: effects,
             nativeBehavior: nativeBehavior);
 
   accept(HVisitor visitor) => visitor.visitForeignCode(this);
 
   bool isJsStatement() => isStatement;
   bool canThrow() {
     if (inputs.length > 0) {
       return inputs.first.canBeNull()
           ? throwBehavior.canThrow
           : throwBehavior.onNonNull.canThrow;
     }
     return throwBehavior.canThrow;
   }
 
   bool onlyThrowsNSM() => throwBehavior.isOnlyNullNSMGuard;
 
   bool get isAllocation =>
       nativeBehavior != null && nativeBehavior.isAllocation && !canBeNull();
 
-  String toString() => 'HForeignCode("${codeTemplate.source}",$inputs)';
+  int typeCode() => HInstruction.FOREIGN_CODE_TYPECODE;
+  bool typeEquals(other) => other is HForeignCode;
+  bool dataEquals(HForeignCode other) {
+    return codeTemplate.source == other.codeTemplate.source;
+  }
+
+  String toString() => 'HForeignCode("${codeTemplate.source}", $inputs)';
 }
 
 abstract class HInvokeBinary extends HInstruction {
   final Selector selector;
   HInvokeBinary(
       HInstruction left, HInstruction right, this.selector, TypeMask type)
       : super(<HInstruction>[left, right], type) {
     sideEffects.clearAllSideEffects();
     sideEffects.clearAllDependencies();
     setUseGvn();
@@ skipping 1513 matching lines @@
 class HDynamicType extends HRuntimeType {
   HDynamicType(DynamicType dartType, TypeMask instructionType)
       : super(const <HInstruction>[], dartType, instructionType);
 
   accept(HVisitor visitor) => visitor.visitDynamicType(this);
 
   int typeCode() => HInstruction.DYNAMIC_TYPE_TYPECODE;
 
   bool typeEquals(HInstruction other) => other is HDynamicType;
 }