df-core.c (df_bb_regno_last_use_find): Do not look for dataflow information attached to non-INSNs such as NOTEs.

	* df-core.c (df_bb_regno_last_use_find): Do not look for dataflow
	information attached to non-INSNs such as NOTEs.
	(df_bb_regno_first_def_find, df_bb_regno_last_def_find): Likewise.

From-SVN: r113748