Fix Windows compile error.

src/mark-compact.cc

 // Copyright 2012 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/v8.h"
 
 #include "src/base/atomicops.h"
 #include "src/code-stubs.h"
 #include "src/compilation-cache.h"
 #include "src/cpu-profiler.h"
@@ skipping 4050 matching lines @@
                              static_cast<int>(p->area_end() - free_start));
     max_freed_bytes = Max(freed_bytes, max_freed_bytes);
   }
 
   p->ResetLiveBytes();
   return max_freed_bytes;
 }
 
 
 int MarkCompactCollector::SweepInParallel(PagedSpace* space,
-                                          int required_freed_bytes) {
+                                          intptr_t required_freed_bytes) {
   PageIterator it(space);
   FreeList* free_list = space == heap()->old_pointer_space()
                             ? free_list_old_pointer_space_.get()
                             : free_list_old_data_space_.get();
   FreeList private_free_list(space);
-  int max_freed = 0;
-  int max_freed_overall = 0;
+  intptr_t max_freed = 0;
+  intptr_t max_freed_overall = 0;
   while (it.has_next()) {
     Page* p = it.next();
 
     if (p->TryParallelSweeping()) {
       max_freed = SweepConservatively<SWEEP_IN_PARALLEL>(
           space, &private_free_list, p);
       free_list->Concatenate(&private_free_list);
       if (required_freed_bytes > 0 && max_freed >= required_freed_bytes) {
         return max_freed;
       }
@@ skipping 416 matching lines @@
   while (buffer != NULL) {
     SlotsBuffer* next_buffer = buffer->next();
     DeallocateBuffer(buffer);
     buffer = next_buffer;
   }
   *buffer_address = NULL;
 }
 
 
 } }  // namespace v8::internal