Return hash of ADDR_EXPR if its argument is CONSTANT_CLASS_P.

2018-10-24  Richard Biener  <rguenther@suse.de>

	* varasm.c (const_hash_1): Return hash of ADDR_EXPR
	if its argument is CONSTANT_CLASS_P.

From-SVN: r265462

gcc/ChangeLog

+2018-10-24  Richard Biener  <rguenther@suse.de>
+
+	* varasm.c (const_hash_1): Return hash of ADDR_EXPR
+	if its argument is CONSTANT_CLASS_P.
+
 2018-10-11  Jan Hubicka  <hubicka@ucw.cz>
 
 	* ipa-utils.h (type_with_linkage_p): No longer check for TYPE_STUB_DECL;

gcc/varasm.c

@@ -3051,6 +3051,10 @@ const_hash_1 (const tree exp)
       }
 
     case ADDR_EXPR:
+      if (CONSTANT_CLASS_P (TREE_OPERAND (exp, 0)))
+       return const_hash_1 (TREE_OPERAND (exp, 0));
+
+      /* Fallthru.  */
     case FDESC_EXPR:
       {
 	struct addr_const value;