make gc branch compile on Win32.

src/heap.cc

Index: src/heap.cc
diff --git a/src/heap.cc b/src/heap.cc
index e383112c49402f1f486059e95d772101126efbeb..b96103f775a825f4ae216971097852e4331c1322 100644
--- a/src/heap.cc
+++ b/src/heap.cc
@@ -4477,9 +4477,9 @@ static bool heap_configured = false;
 // TODO(1236194): Since the heap size is configurable on the command line
 // and through the API, we should gracefully handle the case that the heap
 // size is not big enough to fit all the initial objects.
-bool Heap::ConfigureHeap(intptr_t max_semispace_size,
-                         intptr_t max_old_gen_size,
-                         intptr_t max_executable_size) {
+bool Heap::ConfigureHeap(int max_semispace_size,
+                         int max_old_gen_size,
+                         int max_executable_size) {
   if (HasBeenSetup()) return false;
 
   if (max_semispace_size > 0) max_semispace_size_ = max_semispace_size;