loop-iv: make find_simple_exit static

Function 'find_simple_exit' is used only from loop-iv.c
In 2004-2006 it was also used in predict.c, but since r118694
(992c31e6) it does not.

gcc/ChangeLog:
	* loop-iv.c (find_simple_exit): Make it static.
	* cfgloop.h: Remove the corresponding prototype.

gcc/ChangeLog

 2020-03-10  Roman Zhuykov  <zhroma@ispras.ru>
 
+	* loop-iv.c (find_simple_exit): Make it static.
+	* cfgloop.h: Remove the corresponding prototype.
+
+2020-03-10  Roman Zhuykov  <zhroma@ispras.ru>
+
 	* ddg.c (create_ddg): Fix intendation.
 	(set_recurrence_length): Likewise.
 	(create_ddg_all_sccs): Likewise.

gcc/cfgloop.h

@@ -499,7 +499,6 @@ extern bool iv_analyze_expr (rtx_insn *, scalar_int_mode, rtx,
 			     class rtx_iv *);
 extern rtx get_iv_value (class rtx_iv *, rtx);
 extern bool biv_p (rtx_insn *, scalar_int_mode, rtx);
-extern void find_simple_exit (class loop *, class niter_desc *);
 extern void iv_analysis_done (void);
 
 extern class niter_desc *get_simple_loop_desc (class loop *loop);

gcc/loop-iv.c

@@ -2915,7 +2915,7 @@ check_simple_exit (class loop *loop, edge e, class niter_desc *desc)
 
 /* Finds a simple exit of LOOP and stores its description into DESC.  */
 
-void
+static void
 find_simple_exit (class loop *loop, class niter_desc *desc)
 {
   unsigned i;