remove HIf.hasElse.

lib/compiler/implementation/ssa/codegen.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.
 
 class SsaCodeGeneratorTask extends CompilerTask {
   final JavaScriptBackend backend;
   SsaCodeGeneratorTask(JavaScriptBackend backend)
       : this.backend = backend,
         super(backend.compiler);
   String get name() => 'SSA code generator';
@@ skipping 1685 matching lines @@
       // The subgraph traversal never reached it, so we visit it here
       // instead.
       visitBasicBlock(joinBlock);
     }
 
     // Visit all the dominated blocks that are not part of the then or else
     // branches, and is not the join block.
     // Depending on how the then/else branches terminate
     // (e.g., return/throw/break) there can be any number of these.
     List<HBasicBlock> dominated = node.block.dominatedBlocks;
-    for (int i = node.hasElse ? 2 : 1; i < dominated.length; i++) {
+    for (int i = 2; i < dominated.length; i++) {
       visitBasicBlock(dominated[i]);
     }
   }
 
   visitInvokeDynamicMethod(HInvokeDynamicMethod node) {
     beginExpression(JSPrecedence.CALL_PRECEDENCE);
     use(node.receiver, JSPrecedence.MEMBER_PRECEDENCE);
     buffer.add('.');
     // Avoid adding the generative constructor name to the list of
     // seen selectors.
@@ skipping 1324 matching lines @@
   void handleLoopCondition(HLoopBranch node) {
     buffer.add('if (!');
     use(node.inputs[0], JSPrecedence.PREFIX_PRECEDENCE);
     buffer.add(') break ${currentLabel()};\n');
   }
 
   void generateIf(HIf node, HIfBlockInformation info) {
     HStatementInformation thenGraph = info.thenGraph;
     HStatementInformation elseGraph = info.elseGraph;
     bool thenHasGuards = thenGraph.start.hasGuards();
-    bool elseHasGuards = node.hasElse && elseGraph.start.hasGuards();
+    bool elseHasGuards = elseGraph.start.hasGuards();
     bool hasGuards = thenHasGuards || elseHasGuards;
     if (!hasGuards) return super.generateIf(node, info);
 
     int elseKind = analyzeGraphForCodegen(elseGraph);
-    bool emptyElse = !node.hasElse || elseKind == SsaCodeGenerator.EMPTY;
+    bool emptyElse = elseKind == SsaCodeGenerator.EMPTY;
 
     startBailoutCase(thenGraph.start.guards,
-        node.hasElse ? elseGraph.start.guards : const <HTypeGuard>[]);
+        emptyElse ? const <HTypeGuard>[] : elseGraph.start.guards);
 
     addIndented('if (');
     int precedence = JSPrecedence.EXPRESSION_PRECEDENCE;
     // TODO(ngeoffray): Put the condition initialization in the
     // [setup] buffer.
     List<HTypeGuard> guards = node.thenBlock.guards;
     for (int i = 0, len = guards.length; i < len; i++) {
       buffer.add('state == ${guards[i].state} || ');
     }
     buffer.add('(state == 0 && ');
@@ skipping 33 matching lines @@
       startBailoutSwitch();
     }
   }
 
   void endLabeledBlock(HLabeledBlockInformation labeledBlockInfo) {
     if (labeledBlockInfo.body.start.hasGuards()) {
       endBailoutSwitch();
     }
   }
 }