Fix x64 breakage.

src/mark-compact.cc

 // Copyright 2012 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 3060 matching lines @@
 
 void MarkCompactCollector::EvacuatePages() {
   int npages = evacuation_candidates_.length();
   for (int i = 0; i < npages; i++) {
     Page* p = evacuation_candidates_[i];
     // TODO(hpayer): This check is just used for debugging purpose and
     // should be removed or turned into an assert after investigating the
     // crash in concurrent sweeping.
     CHECK(p->IsEvacuationCandidate() ||
           p->IsFlagSet(Page::RESCAN_ON_EVACUATION));
-    CHECK_EQ(p->parallel_sweeping(), 0);
+    CHECK_EQ(static_cast<int>(p->parallel_sweeping()), 0);
     if (p->IsEvacuationCandidate()) {
       // During compaction we might have to request a new page.
       // Check that space still have room for that.
       if (static_cast<PagedSpace*>(p->owner())->CanExpand()) {
         EvacuateLiveObjectsFromPage(p);
       } else {
         // Without room for expansion evacuation is not guaranteed to succeed.
         // Pessimistically abandon unevacuated pages.
         for (int j = i; j < npages; j++) {
           Page* page = evacuation_candidates_[j];
@@ skipping 1304 matching lines @@
   while (buffer != NULL) {
     SlotsBuffer* next_buffer = buffer->next();
     DeallocateBuffer(buffer);
     buffer = next_buffer;
   }
   *buffer_address = NULL;
 }
 
 
 } }  // namespace v8::internal