Fix Windows compile error.

src/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/v8.h"
 
 #include "src/base/platform/platform.h"
 #include "src/full-codegen.h"
 #include "src/macro-assembler.h"
 #include "src/mark-compact.h"
@@ skipping 2560 matching lines @@
     int remaining =
         static_cast<int>(allocation_info_.limit() - allocation_info_.top());
     heap()->CreateFillerObjectAt(allocation_info_.top(), remaining);
 
     allocation_info_.set_top(NULL);
     allocation_info_.set_limit(NULL);
   }
 }
 
 
-HeapObject* PagedSpace::EnsureSweepingProgress(intptr_t size_in_bytes) {
+HeapObject* PagedSpace::EnsureSweepingProgress(int size_in_bytes) {
+  ASSERT(size_in_bytes >= 0);
   MarkCompactCollector* collector = heap()->mark_compact_collector();
 
   if (collector->IsConcurrentSweepingInProgress(this)) {
     // If sweeping is still in progress try to sweep pages on the main thread.
     intptr_t free_chunk =
         collector->SweepInParallel(this, size_in_bytes);
-    if (free_chunk >= size_in_bytes) {
+    if (free_chunk >= static_cast<intptr_t>(size_in_bytes)) {
       HeapObject* object = free_list_.Allocate(size_in_bytes);
       // We should be able to allocate an object here since we just freed that
       // much memory.
       ASSERT(object != NULL);
       if (object != NULL) return object;
     }
 
     // Wait for the sweeper threads here and complete the sweeping phase.
     collector->WaitUntilSweepingCompleted();
 
@@ skipping 549 matching lines @@
     object->ShortPrint();
     PrintF("\n");
   }
   printf(" --------------------------------------\n");
   printf(" Marked: %x, LiveCount: %x\n", mark_size, LiveBytes());
 }
 
 #endif  // DEBUG
 
 } }  // namespace v8::internal