Make the re-entrancy flag bit width-relative

zend_long is 32 bits on i386, where a constant 1 << 32 does not compile.
Object ids are memory bound (every id owns a zval slot) far below bit 30
on 32-bit and bit 62 on 64-bit, so use the width's second-highest bit.

Author: nicolas-grekas

deepclone.c

@@ -3221,8 +3221,10 @@ typedef struct {
 /* Set on a handle_to_id value while that id's slots are being replayed, so a
  * re-entrant manual initializer call on the same object (from an autoloader or any
  * user code the hydration runs) cannot hydrate it a second time and delete
- * the handle mid-initialization. Object ids are bounded well below 2^32. */
-#define DC_LAZY_HYDRATING (((zend_long) 1) << 32)
+ * the handle mid-initialization. Width-relative bit: object ids are memory
+ * bound (every id owns a zval slot) far below 2^30 on 32-bit zend_long and
+ * below 2^62 on 64-bit. */
+#define DC_LAZY_HYDRATING (((zend_long) 1) << (SIZEOF_ZEND_LONG * 8 - 2))
 
 static zend_class_entry *dc_lazy_ctx_ce;
 static zend_object_handlers dc_lazy_ctx_handlers;