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

src/heap/spaces.cc

 // Copyright 2011 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/heap/spaces.h"
 
 #include <utility>
 
 #include "src/base/bits.h"
 #include "src/base/platform/platform.h"
@@ skipping 296 matching lines @@
   if (!code_range_->SetUp(static_cast<size_t>(code_range_size))) return false;
 
   return true;
 }
 
 
 void MemoryAllocator::TearDown() {
   unmapper()->TearDown();
 
   // Check that spaces were torn down before MemoryAllocator.
-  DCHECK_EQ(size_.Value(), 0);
+  DCHECK_EQ(size_.Value(), 0u);
   // TODO(gc) this will be true again when we fix FreeMemory.
   // DCHECK(size_executable_ == 0);
   capacity_ = 0;
   capacity_executable_ = 0;
 
   if (last_chunk_.IsReserved()) {
     last_chunk_.Release();
   }
 
   delete code_range_;
@@ skipping 284 matching lines @@
   MemoryChunk* next_element = next_chunk();
   MemoryChunk* prev_element = prev_chunk();
   next_element->set_prev_chunk(prev_element);
   prev_element->set_next_chunk(next_element);
   set_prev_chunk(NULL);
   set_next_chunk(NULL);
 }
 
 void MemoryAllocator::ShrinkChunk(MemoryChunk* chunk, size_t bytes_to_shrink) {
   DCHECK_GE(bytes_to_shrink, static_cast<size_t>(base::OS::CommitPageSize()));
-  DCHECK_EQ(0, bytes_to_shrink % base::OS::CommitPageSize());
+  DCHECK_EQ(0u, bytes_to_shrink % base::OS::CommitPageSize());
   Address free_start = chunk->area_end_ - bytes_to_shrink;
   // Don't adjust the size of the page. The area is just uncomitted but not
   // released.
   chunk->area_end_ -= bytes_to_shrink;
   UncommitBlock(free_start, bytes_to_shrink);
   if (chunk->IsFlagSet(MemoryChunk::IS_EXECUTABLE)) {
     if (chunk->reservation_.IsReserved())
       chunk->reservation_.Guard(chunk->area_end_);
     else
       base::OS::Guard(chunk->area_end_, base::OS::CommitPageSize());
@@ skipping 2599 matching lines @@
     object->ShortPrint();
     PrintF("\n");
   }
   printf(" --------------------------------------\n");
   printf(" Marked: %x, LiveCount: %x\n", mark_size, LiveBytes());
 }
 
 #endif  // DEBUG
 }  // namespace internal
 }  // namespace v8