Handle recursive restrict in function parameter

Handle recursive restrict in function parameter

2015-11-04  Tom de Vries  <tom@codesourcery.com>

	PR tree-optimization/67742
	* tree-ssa-structalias.c (struct fieldoff): Add restrict_pointed_type
	field.
	(push_fields_onto_fieldstack): Handle restrict_pointed_type field.
	(create_variable_info_for_1): Add and handle handle_param parameter.
	Add restrict handling.
	(create_variable_info_for): Call create_variable_info_for_1 with extra
	arg.
	(make_param_constraints): Drop restrict_name parameter.  Ignore
	vi->only_restrict_pointers.
	(intra_create_variable_infos): Call create_variable_info_for_1 with
	extra arg.  Remove restrict handling.  Call make_param_constraints with
	one less arg.

	* gcc.dg/tree-ssa/restrict-7.c: New test.
	* gcc.dg/tree-ssa/restrict-8.c: New test.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@229755 138bc75d-0d04-0410-961f-82ee72b054a4