Fix more -Wsign-compare warnings in heap, mips, base, etc.

test/unittests/heap/marking-unittest.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 <stdlib.h>
 
 #include "src/globals.h"
 #include "src/heap/marking.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 100 matching lines @@
 }
 
 TEST(Marking, SetAndClearRange) {
   Bitmap* bitmap = reinterpret_cast<Bitmap*>(
       calloc(Bitmap::kSize / kPointerSize, kPointerSize));
   for (int i = 0; i < 3; i++) {
     bitmap->SetRange(i, Bitmap::kBitsPerCell + i);
     CHECK_EQ(reinterpret_cast<uint32_t*>(bitmap)[0], 0xffffffffu << i);
     CHECK_EQ(reinterpret_cast<uint32_t*>(bitmap)[1], (1u << i) - 1);
     bitmap->ClearRange(i, Bitmap::kBitsPerCell + i);
-    CHECK_EQ(reinterpret_cast<uint32_t*>(bitmap)[0], 0x0);
-    CHECK_EQ(reinterpret_cast<uint32_t*>(bitmap)[1], 0x0);
+    CHECK_EQ(reinterpret_cast<uint32_t*>(bitmap)[0], 0x0u);
+    CHECK_EQ(reinterpret_cast<uint32_t*>(bitmap)[1], 0x0u);
   }
   free(bitmap);
 }
 
 TEST(Marking, ClearMultipleRanges) {
   Bitmap* bitmap = reinterpret_cast<Bitmap*>(
       calloc(Bitmap::kSize / kPointerSize, kPointerSize));
   CHECK(bitmap->AllBitsClearInRange(0, Bitmap::kBitsPerCell * 3));
   bitmap->SetRange(0, Bitmap::kBitsPerCell * 3);
   CHECK_EQ(reinterpret_cast<uint32_t*>(bitmap)[0], 0xffffffffu);
   CHECK_EQ(reinterpret_cast<uint32_t*>(bitmap)[1], 0xffffffffu);
   CHECK_EQ(reinterpret_cast<uint32_t*>(bitmap)[2], 0xffffffffu);
   CHECK(bitmap->AllBitsSetInRange(0, Bitmap::kBitsPerCell * 3));
   bitmap->ClearRange(Bitmap::kBitsPerCell / 2, Bitmap::kBitsPerCell);
   bitmap->ClearRange(Bitmap::kBitsPerCell,
                      Bitmap::kBitsPerCell + Bitmap::kBitsPerCell / 2);
   bitmap->ClearRange(Bitmap::kBitsPerCell * 2 + 8,
                      Bitmap::kBitsPerCell * 2 + 16);
   bitmap->ClearRange(Bitmap::kBitsPerCell * 2 + 24, Bitmap::kBitsPerCell * 3);
-  CHECK_EQ(reinterpret_cast<uint32_t*>(bitmap)[0], 0xffff);
+  CHECK_EQ(reinterpret_cast<uint32_t*>(bitmap)[0], 0xffffu);
   CHECK(bitmap->AllBitsSetInRange(0, Bitmap::kBitsPerCell / 2));
   CHECK(bitmap->AllBitsClearInRange(Bitmap::kBitsPerCell / 2,
                                     Bitmap::kBitsPerCell));
   CHECK_EQ(reinterpret_cast<uint32_t*>(bitmap)[1], 0xffff0000u);
   CHECK(
       bitmap->AllBitsSetInRange(Bitmap::kBitsPerCell + Bitmap::kBitsPerCell / 2,
                                 2 * Bitmap::kBitsPerCell));
   CHECK(bitmap->AllBitsClearInRange(
       Bitmap::kBitsPerCell, Bitmap::kBitsPerCell + Bitmap::kBitsPerCell / 2));
   CHECK_EQ(reinterpret_cast<uint32_t*>(bitmap)[2], 0xff00ffu);
   CHECK(bitmap->AllBitsSetInRange(2 * Bitmap::kBitsPerCell,
                                   2 * Bitmap::kBitsPerCell + 8));
   CHECK(bitmap->AllBitsClearInRange(2 * Bitmap::kBitsPerCell + 24,
                                     Bitmap::kBitsPerCell * 3));
   free(bitmap);
 }
 }  // namespace internal
 }  // namespace v8