re PR tree-optimization/55281 (ICE in  build_int_cst_wide, at tree.c:1217  (with Ofast, ok with O3))

	PR tree-optimization/55281
	* tree-vect-generic.c (expand_vector_condition): Accept any
	is_gimple_val rather than just SSA_NAME if not COMPARISON_CLASS_P.
	* fold-const.c (fold_ternary_loc): Fold VEC_COND_EXPR if arg0 is
	either integer_all_onesp or integer_zerop.
	* tree-vect-stmts.c (vectorizable_condition): Build the condition
	using corresponding vector integer type instead of vectype.

	* gcc.dg/vect/fast-math-pr55281.c: New test.
	* g++.dg/opt/pr55281.C: New test.

From-SVN: r193471