re PR tree-optimization/92558 (Miscompare of 554.roms_r with -Ofast -march=znver2 -flto since r278289)

2019-11-18  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/92558
	* tree-vect-loop.c (vect_create_epilog_for_reduction): When
	reducting the width of a reduction vector def update new_phis.

	* gcc.dg/vect/pr92558.c: New testcase.

From-SVN: r278400