Fix gcc 4.9.2 signed-compare error.

test/cctest/compiler/test-run-machops.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.
 
 // TODO(jochen): Remove this after the setting is turned on globally.
 #define V8_IMMINENT_DEPRECATION_WARNINGS
 
 #include <cmath>
 #include <functional>
 #include <limits>
@@ skipping 5441 matching lines @@
                 {0x3ffffffffff, 0x428ffffffffff800},
                 {0x1ffffffffff, 0x427ffffffffff000},
                 {0x8000008000000000, 0x43e0000010000000},
                 {0x8000008000000001, 0x43e0000010000000},
                 {0x8000000000000400, 0x43e0000000000000},
                 {0x8000000000000401, 0x43e0000000000001}};
 
   BufferedRawMachineAssemblerTester<double> m(kMachUint64);
   m.Return(m.RoundUint64ToFloat64(m.Parameter(0)));
 
-  for (int i = 0; i < arraysize(values); i++) {
+  for (size_t i = 0; i < arraysize(values); i++) {
     CHECK_EQ(bit_cast<double>(values[i].expected), m.Call(values[i].input));
   }
 }
 
 
 TEST(RunRoundUint64ToFloat32) {
   struct {
     uint64_t input;
     uint32_t expected;
   } values[] = {{0x0, 0x0},
@@ skipping 69 matching lines @@
                 {0x3ffffffffff, 0x54800000},
                 {0x1ffffffffff, 0x54000000},
                 {0x8000008000000000, 0x5f000000},
                 {0x8000008000000001, 0x5f000001},
                 {0x8000000000000400, 0x5f000000},
                 {0x8000000000000401, 0x5f000000}};
 
   BufferedRawMachineAssemblerTester<float> m(kMachUint64);
   m.Return(m.RoundUint64ToFloat32(m.Parameter(0)));
 
-  for (int i = 0; i < arraysize(values); i++) {
+  for (size_t i = 0; i < arraysize(values); i++) {
     CHECK_EQ(bit_cast<float>(values[i].expected), m.Call(values[i].input));
   }
 }
 
 
 #endif
 
 
 TEST(RunBitcastFloat32ToInt32) {
   float input = 32.25;
@@ skipping 70 matching lines @@
   Node* call = r.AddNode(r.common()->Call(desc), phi);
   r.Return(call);
 
   CHECK_EQ(33, r.Call(1));
   CHECK_EQ(44, r.Call(0));
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8