Fix bugs in simplified lowering relating to int32/uint32 signs.

test/cctest/compiler/test-machine-operator-reducer.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "test/cctest/cctest.h"
 
 #include "src/base/utils/random-number-generator.h"
 #include "src/codegen.h"
 #include "src/compiler/graph-inl.h"
 #include "src/compiler/js-graph.h"
@@ skipping 38 matching lines @@
   return OpParameter<double>(op);
 }
 
 
 class ReducerTester : public HandleAndZoneScope {
  public:
   explicit ReducerTester(int num_parameters = 0)
       : isolate(main_isolate()),
         binop(NULL),
         unop(NULL),
+        machine(main_zone()),
         common(main_zone()),
         graph(main_zone()),
         javascript(main_zone()),
         typer(&graph, MaybeHandle<Context>()),
         jsgraph(&graph, &common, &javascript, &machine),
         maxuint32(Constant<int32_t>(kMaxUInt32)) {
     Node* s = graph.NewNode(common.Start(num_parameters));
     graph.SetStart(s);
   }
 
@@ skipping 763 matching lines @@
 // TODO(titzer): test MachineOperatorReducer for Int64Mul
 // TODO(titzer): test MachineOperatorReducer for Int64UMul
 // TODO(titzer): test MachineOperatorReducer for Int64Div
 // TODO(titzer): test MachineOperatorReducer for Uint64Div
 // TODO(titzer): test MachineOperatorReducer for Int64Mod
 // TODO(titzer): test MachineOperatorReducer for Uint64Mod
 // TODO(titzer): test MachineOperatorReducer for Int64Neg
 // TODO(titzer): test MachineOperatorReducer for ChangeInt32ToFloat64
 // TODO(titzer): test MachineOperatorReducer for ChangeFloat64ToInt32
 // TODO(titzer): test MachineOperatorReducer for Float64Compare