remove cast in delete_insn_chain

gcc/ChangeLog:

2016-11-01  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* cfgrtl.c (delete_insn_chain): Change argument type to rtx_insn *
	and adjust for that.
	* cfgrtl.h (delete_insn_chain): Adjust prototype.

From-SVN: r241772

gcc/ChangeLog

 2016-11-01  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>
 
+	* cfgrtl.c (delete_insn_chain): Change argument type to rtx_insn *
+	and adjust for that.
+	* cfgrtl.h (delete_insn_chain): Adjust prototype.
+
+2016-11-01  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>
+
 	* config/rl78/rl78.c (gen-and_emit_move): Change argument type
 	to rtx_insn *.
 	(transcode_memory_rtx): Likewise.

gcc/cfgrtl.c

@@ -240,17 +240,15 @@ delete_insn_and_edges (rtx_insn *insn)
    insns that cannot be removed to NULL.  */
 
 void
-delete_insn_chain (rtx start, rtx finish, bool clear_bb)
+delete_insn_chain (rtx start, rtx_insn *finish, bool clear_bb)
 {
-  rtx_insn *prev, *current;
-
   /* Unchain the insns one by one.  It would be quicker to delete all of these
      with a single unchaining, rather than one at a time, but we need to keep
      the NOTE's.  */
-  current = safe_as_a <rtx_insn *> (finish);
+  rtx_insn *current = finish;
   while (1)
     {
-      prev = PREV_INSN (current);
+      rtx_insn *prev = PREV_INSN (current);
       if (NOTE_P (current) && !can_delete_note_p (as_a <rtx_note *> (current)))
 	;
       else

gcc/cfgrtl.h

@@ -22,7 +22,7 @@ along with GCC; see the file COPYING3.  If not see
 
 extern void delete_insn (rtx);
 extern bool delete_insn_and_edges (rtx_insn *);
-extern void delete_insn_chain (rtx, rtx, bool);
+extern void delete_insn_chain (rtx, rtx_insn *, bool);
 extern basic_block create_basic_block_structure (rtx_insn *, rtx_insn *,
 						 rtx_note *, basic_block);
 extern void compute_bb_for_insn (void);