* config/ia64/ia64.md (prologue_use): New.
	* config/ia64/ia64.c (ia64_expand_prologue): Use
	gen_prologue_use instead of gen_rtx_USE.
	(group_barrier_needed_p): Handle CODE_FOR_prologue_use the same way
	as CODE_FOR_pred_rel_mutex.
	(ia64_sched_reorder2): Likewise.

	* gcc.c-torture/compile/20020116-1.c: New test.

From-SVN: r48946