When reordering constructor initializers, use correct types for temp vars.

pkg/front_end/lib/src/fasta/kernel/body_builder.dart

 // Copyright (c) 2016, 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.
 
 library fasta.body_builder;
 
 import 'package:kernel/ast.dart'
     hide InvalidExpression, InvalidInitializer, InvalidStatement;
 
 import 'package:kernel/class_hierarchy.dart' show ClassHierarchy;
@@ skipping 493 matching lines @@
             if (member.isExternal) {
               initializer = buildInvalidInitializer(
                   deprecated_buildCompileTimeError(
                       "An external constructor can't initialize fields.",
                       formal.charOffset),
                   formal.charOffset);
             } else {
               initializer = buildFieldInitializer(true, formal.name,
                   formal.charOffset, new VariableGet(formal.declaration));
             }
-            member.addInitializer(initializer);
+            member.addInitializer(initializer, _typeInferrer);
           }
         }
       }
     }
   }
 
   @override
   void handleNoInitializers() {
     debugEvent("NoInitializers");
     if (functionNestingLevel == 0) {
@@ skipping 41 matching lines @@
     } else {
       Expression value = toValue(node);
       if (node is! Throw) {
         value =
             wrapInCompileTimeError(value, fasta.messageExpectedAnInitializer);
       }
       initializer = buildInvalidInitializer(node, token.charOffset);
     }
     _typeInferrer.inferInitializer(initializer);
     if (member is KernelConstructorBuilder && !member.isExternal) {
-      member.addInitializer(initializer);
+      member.addInitializer(initializer, _typeInferrer);
     } else {
       deprecated_addCompileTimeError(
           token.charOffset, "Can't have initializers: ${member.name}");
     }
   }
 
   DartType _computeReturnTypeContext(MemberBuilder member) {
     if (member is KernelProcedureBuilder) {
       return member.target.function.returnType;
     } else {
@@ skipping 3214 matching lines @@
       return AsyncMarker.Async;
     } else {
       assert(identical(starToken.stringValue, "*"));
       return AsyncMarker.AsyncStar;
     }
   } else {
     return unhandled(asyncToken.lexeme, "asyncMarkerFromTokens",
         asyncToken.charOffset, null);
   }
 }