re PR rtl-optimization/59166 (ICE in simplify_subreg, at simplify-rtx.c:5901 on valid code (at -O1 and above with -g enabled))

	PR rtl-optimization/59166
	* ira.c (find_moveable_pseudos): Use DF_REF_REAL_LOC instead of
	DF_REF_LOC in validate_change call.
	(split_live_ranges_for_shrink_wrap): Likewise.

	* gcc.dg/torture/pr59166.c: New test.

From-SVN: r205413