re PR rtl-optimization/88593 (cleanup_cfg may make cached dominance info stale)

2019-02-01  Richard Biener  <rguenth@suse.de>

	PR rtl-optimization/88593
	* mode-switching.c (optimize_mode_switching): Free dominators before
	calling cleanup_cfg.

From-SVN: r268442

gcc/ChangeLog

+2019-02-01  Richard Biener  <rguenth@suse.de>
+
+	PR rtl-optimization/88593
+	* mode-switching.c (optimize_mode_switching): Free dominators before
+	calling cleanup_cfg.
+
 2019-02-01  Bin Cheng  <bin.cheng@linux.alibaba.com>
 
 	PR tree-optimization/88932

gcc/mode-switching.c

@@ -856,7 +856,10 @@ optimize_mode_switching (void)
     commit_edge_insertions ();
 
   if (targetm.mode_switching.entry && targetm.mode_switching.exit)
-    cleanup_cfg (CLEANUP_NO_INSN_DEL);
+    {
+      free_dominance_info (CDI_DOMINATORS);
+      cleanup_cfg (CLEANUP_NO_INSN_DEL);
+    }
   else if (!need_commit && !emitted)
     return 0;