Fix a bug in the variable allocator: a pure instruction between an inlined if and its inlined expre…

sdk/lib/_internal/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.
 
 part of ssa;
 
 class SsaCodeGeneratorTask extends CompilerTask {
 
   final JavaScriptBackend backend;
 
@@ skipping 281 matching lines @@
   endGraph(HGraph graph);
 
   preLabeledBlock(HLabeledBlockInformation labeledBlockInfo);
   startLabeledBlock(HLabeledBlockInformation labeledBlockInfo);
   endLabeledBlock(HLabeledBlockInformation labeledBlockInfo);
 
   void preGenerateMethod(HGraph graph) {
     new SsaInstructionMerger(generateAtUseSite, compiler).visitGraph(graph);
     new SsaConditionMerger(
         generateAtUseSite, controlFlowOperators).visitGraph(graph);
-    SsaLiveIntervalBuilder intervalBuilder =
-        new SsaLiveIntervalBuilder(compiler, generateAtUseSite);
+    SsaLiveIntervalBuilder intervalBuilder = new SsaLiveIntervalBuilder(
+        compiler, generateAtUseSite, controlFlowOperators);
     intervalBuilder.visitGraph(graph);
     SsaVariableAllocator allocator = new SsaVariableAllocator(
         compiler,
         intervalBuilder.liveInstructions,
         intervalBuilder.liveIntervals,
         generateAtUseSite);
     allocator.visitGraph(graph);
     variableNames = allocator.names;
     shouldGroupVarDeclarations = allocator.names.numberOfVariables > 1;
   }
@@ skipping 2674 matching lines @@
   if (leftType.canBeNull() && rightType.canBeNull()) {
     if (left.isConstantNull() || right.isConstantNull() ||
         (leftType.isPrimitive(compiler) && leftType == rightType)) {
       return '==';
     }
     return null;
   } else {
     return '===';
   }
 }