remove HIf.hasElse.

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 visitBitAnd(HBitAnd node);
   R visitBitNot(HBitNot node);
   R visitBitOr(HBitOr node);
   R visitBitXor(HBitXor node);
@@ skipping 1730 matching lines @@
   HParameterValue exception;
   HBasicBlock catchBlock;
   HBasicBlock finallyBlock;
   HTry() : super(const <HInstruction>[]);
   toString() => 'try';
   accept(HVisitor visitor) => visitor.visitTry(this);
   HBasicBlock get joinBlock() => this.block.successors.last();
 }
 
 class HIf extends HConditionalBranch {
-  bool hasElse;
   HBlockFlow blockInformation = null;
-  HIf(HInstruction condition, this.hasElse) : super(<HInstruction>[condition]);
+  HIf(HInstruction condition) : super(<HInstruction>[condition]);
   toString() => 'if';
   accept(HVisitor visitor) => visitor.visitIf(this);
 
   HBasicBlock get thenBlock() {
     assert(block.dominatedBlocks[0] === block.successors[0]);
     return block.successors[0];
   }
 
   HBasicBlock get elseBlock() {
-    if (hasElse) {
-      assert(block.dominatedBlocks[1] === block.successors[1]);
-      return block.successors[1];
-    } else {
-      return null;
-    }
+    assert(block.dominatedBlocks[1] === block.successors[1]);
+    return block.successors[1];
   }
 
   HBasicBlock get joinBlock() => blockInformation.continuation;
 }
 
 class HLoopBranch extends HConditionalBranch {
   static final int CONDITION_FIRST_LOOP = 0;
   static final int DO_WHILE_LOOP = 1;
 
   final int kind;
@@ skipping 850 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);
 }