re PR tree-optimization/90211 (ICE: tree check: expected ssa_name, have real_cst in first_readonly_imm_use, at ssa-iterators.h:351)

	PR tree-optimization/90211
	* tree-parloops.c (try_create_reduction_list): Ignore phi arguments
	which are not SSA_NAMEs.

	* gcc.dg/autopar/pr90211.c: New test.

From-SVN: r270533