Fix mistake in previous commit r10383

lib/compiler/implementation/ssa/builder.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 Interceptors {
   Compiler compiler;
   Interceptors(Compiler this.compiler);
 
   SourceString mapOperatorToMethodName(Operator op) {
     String name = op.source.stringValue;
@@ skipping 158 matching lines @@
       assert(graph.isValid());
       bool inLoop = functionsCalledInLoop.contains(element);
       if (!inLoop) {
         Selector selector = selectorsCalledInLoop[element.name];
         inLoop = selector !== null && selector.applies(element, compiler);
       }
       graph.calledInLoop = inLoop;
 
       // If there is an estimate of the parameter types assume these types when
       // compiling.
-      List<HType> parameterTypes;
+      List<HType> parameterTypes =
           backend.optimisticParameterTypesWithRecompilationOnTypeChange(
               element);
       if (parameterTypes != null) {
         FunctionSignature signature = element.computeSignature(compiler);
         int i = 0;
         signature.forEachParameter((Element param) {
           builder.parameters[param].guaranteedType = parameterTypes[i++];
         });
       }
 
@@ skipping 3425 matching lines @@
           new HSubGraphBlockInformation(elseBranch.graph));
 
     HBasicBlock conditionStartBlock = conditionBranch.block;
     conditionStartBlock.setBlockFlow(info, joinBlock);
     SubGraph conditionGraph = conditionBranch.graph;
     HIf branch = conditionGraph.end.last;
     assert(branch is HIf);
     branch.blockInformation = conditionStartBlock.blockFlow;
   }
 }