X64: Convert smis to holding 32 bits of payload.

src/execution.cc

Index: src/execution.cc
diff --git a/src/execution.cc b/src/execution.cc
index 8bc6b74e141628794d5be48d859a486bf7f148f5..50bbafc59a49c73dd1c950544a43e64e0ecd826c 100644
--- a/src/execution.cc
+++ b/src/execution.cc
@@ -96,8 +96,11 @@ static Handle<Object> Invoke(bool construct,
     JSEntryFunction entry = FUNCTION_CAST<JSEntryFunction>(code->entry());
 
     // Call the function through the right JS entry stub.
-    value = CALL_GENERATED_CODE(entry, func->code()->entry(), *func,
-                                *receiver, argc, args);
+    byte* entry_address= func->code()->entry();
+    JSFunction* function = *func;
+    Object* receiver_pointer = *receiver;
+    value = CALL_GENERATED_CODE(entry, entry_address, function,
+                                receiver_pointer, argc, args);
   }
 
 #ifdef DEBUG