Fix another casting problem in Win64

src/deoptimizer.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 90 matching lines @@
 }
 
 
 // No larger than 2K on all platforms
 static const int kDeoptTableMaxEpilogueCodeSize = 2 * KB;
 
 
 size_t Deoptimizer::GetMaxDeoptTableSize() {
   int entries_size =
       Deoptimizer::kMaxNumberOfEntries * Deoptimizer::table_entry_size_;
+  int commit_page_size = static_cast<int>(OS::CommitPageSize());
   int page_count = ((kDeoptTableMaxEpilogueCodeSize + entries_size - 1) /
-                    OS::CommitPageSize()) + 1;
-  return OS::CommitPageSize() * page_count;
+                    commit_page_size) + 1;
+  return static_cast<size_t>(commit_page_size * page_count);
 }
 
 
 Deoptimizer* Deoptimizer::Grab(Isolate* isolate) {
   ASSERT(isolate == Isolate::Current());
   Deoptimizer* result = isolate->deoptimizer_data()->current_;
   ASSERT(result != NULL);
   result->DeleteFrameDescriptions();
   isolate->deoptimizer_data()->current_ = NULL;
   return result;
@@ skipping 1897 matching lines @@
 
 void DeoptimizedFrameInfo::Iterate(ObjectVisitor* v) {
   v->VisitPointer(BitCast<Object**>(&function_));
   v->VisitPointers(parameters_, parameters_ + parameters_count_);
   v->VisitPointers(expression_stack_, expression_stack_ + expression_count_);
 }
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 } }  // namespace v8::internal