re PR c/71598 (Wrong optimization with aliasing enums)

re PR c/71598 (Wrong optimization with aliasing enums)

2019-04-01  Richard Biener  <rguenther@suse.de>

	PR c/71598
	* gimple.c: Include langhooks.h.
	(gimple_get_alias_set): Treat enumeral types as the underlying
	integer type.

	c/
	* c-tree.h (c_get_alias_set): Declare.
	* c-objc-common.h (LANG_HOOKS_GET_ALIAS_SET): Use c_get_alias_set.
	* c-objc-common.c (c_get_alias_set): Treat enumeral types
	as the underlying integer type.

	* gcc.dg/torture/pr71598-1.c: New testcase.
	* gcc.dg/torture/pr71598-2.c: Likewise.
	* gcc.dg/torture/pr71598-3.c: Likewise.

From-SVN: r270052