backport: re PR tree-optimization/91280 (ICE in get_constraint_for_component_ref...

backport: re PR tree-optimization/91280 (ICE in get_constraint_for_component_ref, at tree-ssa-structalias.c:3259 since r260354)

2019-08-02  Richard Biener  <rguenther@suse.de>

	Backport from mainline
	2019-07-31  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/91280
	* tree-ssa-structalias.c (get_constraint_for_component_ref):
	Decompose MEM_REF manually for offset handling.

	* g++.dg/torture/pr91280.C: New testcase.

	2019-07-31  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/91293
	* tree-vect-slp.c (vect_build_slp_tree_2): Do not swap operands
	of reduction stmts.

	* gcc.dg/vect/pr91293-1.c: New testcase.
	* gcc.dg/vect/pr91293-2.c: Likewise.
	* gcc.dg/vect/pr91293-3.c: Likewise.

From-SVN: r274007