Fix compilation on 64-bit Windows build.

src/deoptimizer.cc

 // Copyright 2011 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 539 matching lines @@
     Address top, intptr_t size, DeoptimizedFrameInfo* info) {
   ASSERT_EQ(DEBUGGER, bailout_type_);
   for (int i = 0; i < deferred_heap_numbers_.length(); i++) {
     HeapNumberMaterializationDescriptor d = deferred_heap_numbers_[i];
 
     // Check of the heap number to materialize actually belong to the frame
     // being extracted.
     Address slot = d.slot_address();
     if (top <= slot && slot < top + size) {
       Handle<Object> num = isolate_->factory()->NewNumber(d.value());
-      int expression_index =
-          info->expression_count_ - (slot - top) / kPointerSize - 1;
+      int expression_index = static_cast<int>(
+          info->expression_count_ - (slot - top) / kPointerSize - 1);
       if (FLAG_trace_deopt) {
         PrintF("Materializing a new heap number %p [%e] in slot %p"
                "for expression stack index %d\n",
                reinterpret_cast<void*>(*num),
                d.value(),
                d.slot_address(),
                expression_index);
       }
       info->SetExpression(expression_index, *num);
     }
@@ skipping 549 matching lines @@
     // Incoming parameter.
     unsigned base = static_cast<unsigned>(GetFrameSize() -
         deoptimizer->ComputeIncomingArgumentSize(GetFunction()));
     return base - ((slot_index + 1) * kPointerSize);
   }
 }
 
 
 unsigned FrameDescription::GetExpressionCount(Deoptimizer* deoptimizer) {
   ASSERT_EQ(Code::FUNCTION, kind_);
-  return (GetFrameSize() - deoptimizer->ComputeFixedSize(GetFunction()))
-      / kPointerSize;
+  intptr_t size = GetFrameSize() - deoptimizer->ComputeFixedSize(GetFunction());
+  return static_cast<unsigned>(size / kPointerSize);
 }
 
 
 Object* FrameDescription::GetExpression(Deoptimizer* deoptimizer, int index) {
   ASSERT_EQ(Code::FUNCTION, kind_);
   unsigned offset = GetOffsetFromSlotIndex(deoptimizer, index);
   return reinterpret_cast<Object*>(*GetFrameSlotPointer(offset));
 }
 
 
@@ skipping 283 matching lines @@
 DeoptimizedFrameInfo::~DeoptimizedFrameInfo() {
   delete expression_stack_;
 }
 
 void DeoptimizedFrameInfo::Iterate(ObjectVisitor* v) {
   v->VisitPointers(expression_stack_, expression_stack_ + expression_count_);
 }
 
 
 } }  // namespace v8::internal