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

test/unittests/compiler/node-matchers-unittest.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 "src/compiler/common-operator.h"
 #include "src/compiler/graph.h"
 #include "src/compiler/machine-operator.h"
 #include "src/compiler/node.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/opcodes.h"
 
 #include "test/unittests/compiler/graph-unittest.h"
 #include "test/unittests/test-utils.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 class NodeMatcherTest : public GraphTest {
  public:
-  NodeMatcherTest() {}
+  NodeMatcherTest() : machine_(zone()) {}
   virtual ~NodeMatcherTest() {}
 
   MachineOperatorBuilder* machine() { return &machine_; }
 
  private:
   MachineOperatorBuilder machine_;
 };
 
 namespace {
 
@@ skipping 276 matching lines @@
   // S3 + (O0 + C0) -> [p1, 2, o0, c0]
   s3 = graph()->NewNode(s_op, p1, c3);
   ScaledWithOffsetMatcher match43(
       graph()->NewNode(a_op, s3, graph()->NewNode(a_op, o0, c0)));
   CheckScaledWithOffsetMatch(&match43, p1, 3, o0, c0);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8