Fixes bug 87330 by invoking df_note_add_problem to recompute REG_DEAD and…

Fixes bug 87330 by invoking  df_note_add_problem to recompute REG_DEAD and REG_UNUSED notes before analysis.

From-SVN: r265618

gcc/ChangeLog

+2018-10-30 Sameera Deshpande <sameera.deshpande@linaro.org
+
+	* gcc/config/aarch64/falkor-tag-collision-avoidance.c
+	(execute_tag_collision_avoidance): Call df_note_add_problem.
+
 2018-10-30  Martin Liska  <mliska@suse.cz>
 
 	* doc/extend.texi: Fix typo in documentation

gcc/config/aarch64/falkor-tag-collision-avoidance.c

@@ -805,6 +805,7 @@ execute_tag_collision_avoidance ()
   df_set_flags (DF_RD_PRUNE_DEAD_DEFS);
   df_chain_add_problem (DF_UD_CHAIN);
   df_compute_regs_ever_live (true);
+  df_note_add_problem ();
   df_analyze ();
   df_set_flags (DF_DEFER_INSN_RESCAN);