Fix warnings on Win64.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index f80224634737f293987c2e559650e9e9e49f1fab..aebfc2421c61aff0559fb3265df7c4eccf0c500e 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -2790,7 +2790,7 @@ class Code: public HeapObject {
 
   // Relocate the code by delta bytes. Called to signal that this code
   // object has been moved by delta bytes.
-  void Relocate(int delta);
+  void Relocate(intptr_t delta);
 
   // Migrate code described by desc.
   void CopyFrom(const CodeDesc& desc);