make gc branch compile on Win32.

src/heap.h

Index: src/heap.h
diff --git a/src/heap.h b/src/heap.h
index 1fbe4c9f235e7a2c1e98a36491d74d3838cfa1a0..c8782ed9d351ba954219c4e19bad966a2bfe8c89 100644
--- a/src/heap.h
+++ b/src/heap.h
@@ -352,9 +352,9 @@ class Heap {
  public:
   // Configure heap size before setup. Return false if the heap has been
   // setup already.
-  bool ConfigureHeap(intptr_t max_semispace_size,
-                     intptr_t max_old_gen_size,
-                     intptr_t max_executable_size);
+  bool ConfigureHeap(int max_semispace_size,
+                     int max_old_gen_size,
+                     int max_executable_size);
   bool ConfigureHeapDefault();
 
   // Initializes the global object heap. If create_heap_objects is true,