re PR rtl-optimization/61058 (ICE: RTL check: expected elt 3 type 'B', have '0' (rtx barrier) in distance_agu_use_in_bb, at config/i386/i386.c:16740 with __builtin_unreachable())

	PR rtl-optimization/61058
	* jump.c (cleanup_barriers): Update basic block boundaries
	if BLOCK_FOR_INSN is non-NULL on PREV.

	* gcc.dg/pr61058.c: New test.

From-SVN: r220155