Up the initial constant mapping size a bit.

src/constants.c

@@ -230,7 +230,7 @@ void present_constant_profiling(void)
 
 void init_builtin_constants(void)
 {
-  builtin_constants = allocate_mapping(300);
+  builtin_constants = allocate_mapping(325);
 }
 
 void exit_builtin_constants(void)