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

test/cctest/heap/test-spaces.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 724 matching lines @@
       heap::FillOldSpacePageWithFixedArrays(CcTest::heap(), kFillerSize);
   Handle<FixedArray> array = arrays.back();
   Page* page = Page::FromAddress(array->address());
   CHECK_EQ(page->area_end(), array->address() + array->Size() + kFillerSize);
 
   // Reset space so high water mark and fillers are consistent.
   CcTest::heap()->old_space()->ResetFreeList();
   CcTest::heap()->old_space()->EmptyAllocationInfo();
 
   const size_t shrinked = page->ShrinkToHighWaterMark();
-  CHECK_EQ(0, shrinked);
+  CHECK_EQ(0u, shrinked);
 }
 
 TEST(ShrinkPageToHighWaterMarkOneWordFiller) {
   CcTest::InitializeVM();
   Isolate* isolate = CcTest::i_isolate();
   HandleScope scope(isolate);
 
   heap::SealCurrentObjects(CcTest::heap());
 
   const int kFillerSize = kPointerSize;
   std::vector<Handle<FixedArray>> arrays =
       heap::FillOldSpacePageWithFixedArrays(CcTest::heap(), kFillerSize);
   Handle<FixedArray> array = arrays.back();
   Page* page = Page::FromAddress(array->address());
   CHECK_EQ(page->area_end(), array->address() + array->Size() + kFillerSize);
 
   // Reset space so high water mark and fillers are consistent.
   CcTest::heap()->old_space()->ResetFreeList();
   CcTest::heap()->old_space()->EmptyAllocationInfo();
 
   HeapObject* filler =
       HeapObject::FromAddress(array->address() + array->Size());
   CHECK_EQ(filler->map(), CcTest::heap()->one_pointer_filler_map());
 
   const size_t shrinked = page->ShrinkToHighWaterMark();
-  CHECK_EQ(0, shrinked);
+  CHECK_EQ(0u, shrinked);
 }
 
 TEST(ShrinkPageToHighWaterMarkTwoWordFiller) {
   CcTest::InitializeVM();
   Isolate* isolate = CcTest::i_isolate();
   HandleScope scope(isolate);
 
   heap::SealCurrentObjects(CcTest::heap());
 
   const int kFillerSize = 2 * kPointerSize;
   std::vector<Handle<FixedArray>> arrays =
       heap::FillOldSpacePageWithFixedArrays(CcTest::heap(), kFillerSize);
   Handle<FixedArray> array = arrays.back();
   Page* page = Page::FromAddress(array->address());
   CHECK_EQ(page->area_end(), array->address() + array->Size() + kFillerSize);
 
   // Reset space so high water mark and fillers are consistent.
   CcTest::heap()->old_space()->ResetFreeList();
   CcTest::heap()->old_space()->EmptyAllocationInfo();
 
   HeapObject* filler =
       HeapObject::FromAddress(array->address() + array->Size());
   CHECK_EQ(filler->map(), CcTest::heap()->two_pointer_filler_map());
 
   const size_t shrinked = page->ShrinkToHighWaterMark();
-  CHECK_EQ(0, shrinked);
+  CHECK_EQ(0u, shrinked);
 }
 
 }  // namespace internal
 }  // namespace v8