2018-06-01  Richard Biener  <rguenther@suse.de>

	PR ipa/85960
	* tree-ssa-structalias.c (get_function_part_constraint):
	Handle NULL fi->decl.
	(find_func_aliases_for_call): Properly handle indirect
	fi from direct call.
	(find_func_clobbers): Likewise.
	(ipa_pta_execute): Likewise.
	(create_variable_info_for): For functions that are ifunc_resolver
	resolve to a varinfo that contains the result of the resolver
	call.
	(associate_varinfo_to_alias): Do not treat ifunc resolvers as
	aliases.

	* gcc.dg/ipa/ipa-pta-19.c: New testcase.

From-SVN: r261056