Fix x64 build after executable memory limit change.

TBR=jschuh@chromium.org
Review URL: http://codereview.chromium.org/4656002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5801 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/spaces.h

@@ -492,7 +492,7 @@ class MemoryAllocator : public AllStatic {
  public:
   // Initializes its internal bookkeeping structures.
   // Max capacity of the total space and executable memory limit.
-  static bool Setup(int max_capacity, int capacity_executable);
+  static bool Setup(intptr_t max_capacity, intptr_t capacity_executable);
 
   // Deletes valid chunks.
   static void TearDown();