[turbofan] Fix -Wsign-compare warnings.

test/cctest/compiler/test-run-load-store.cc

 // Copyright 2016 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 <cmath>
 #include <functional>
 #include <limits>
 
 #include "src/base/bits.h"
 #include "src/base/utils/random-number-generator.h"
@@ skipping 970 matching lines @@
     // randomize memory.
     v8::base::RandomNumberGenerator rng;
     rng.SetSeed(100);
     rng.NextBytes(&buffer[0], sizeof(buffer));
   }
 
   // in-bounds accesses.
   for (uint32_t i = 0; i < kNumElems; i++) {
     uint32_t offset = static_cast<uint32_t>(i * sizeof(int32_t));
     uint32_t expected = buffer[i];
-    CHECK_EQ(expected, m.Call(offset + pseudo_base, kLength));
+    CHECK_EQ(expected,
+             static_cast<uint32_t>(m.Call(offset + pseudo_base, kLength)));
   }
 
   // slightly out-of-bounds accesses.
-  for (int32_t i = kNumElems; i < kNumElems + 30; i++) {
-    uint32_t offset = static_cast<uint32_t>(i * sizeof(int32_t));
+  for (uint32_t i = kNumElems; i < kNumElems + 30; i++) {
+    uint32_t offset = i * sizeof(int32_t);
     CheckOobValue(m.Call(offset + pseudo_base, kLength));
   }
 
   // way out-of-bounds accesses.
   for (uint64_t i = pseudo_base + sizeof(buffer); i < 0xFFFFFFFF;
        i += A_BILLION) {
     uint32_t offset = static_cast<uint32_t>(i);
     CheckOobValue(m.Call(offset, kLength));
   }
 }
@@ skipping 174 matching lines @@
   TestRunOobCheckedLoadT_pseudo<int32_t>(4 * A_BILLION, true);
   TestRunOobCheckedLoadT_pseudo<float>(4 * A_BILLION, false);
   TestRunOobCheckedLoadT_pseudo<float>(4 * A_BILLION, true);
   TestRunOobCheckedLoadT_pseudo<double>(4 * A_BILLION, false);
   TestRunOobCheckedLoadT_pseudo<double>(4 * A_BILLION, true);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8