[ARC] Test against frame_pointer_needed in arc_can_eliminate.

arc_can_eliminate is using arc_frmae_pointer_required() which is wrong
as the frame_pointer_needed can be set on different conditions. Fix it
by calling arc_frame_pointer_needed().

gcc/
2017-06-01  Claudiu Zissulescu  <claziss@synopsys.com>

	* config/arc/arc.c (arc_can_eliminate): Test against
	arc_frame_pointer_needed.

From-SVN: r248782

gcc/ChangeLog

 2017-06-01  Claudiu Zissulescu  <claziss@synopsys.com>
 
+	* config/arc/arc.c (arc_can_eliminate): Test against
+	arc_frame_pointer_needed.
+
+2017-06-01  Claudiu Zissulescu  <claziss@synopsys.com>
+
 	* config/arc/arc.c (arc_expand_prologue): Emit a special barrier
 	to prevent store reordering.
 	* config/arc/arc.md (UNSPEC_ARC_STKTIE): Define.

gcc/config/arc/arc.c

@@ -4644,7 +4644,7 @@ arc_final_prescan_insn (rtx_insn *insn, rtx *opvec ATTRIBUTE_UNUSED,
 static bool
 arc_can_eliminate (const int from ATTRIBUTE_UNUSED, const int to)
 {
-  return to == FRAME_POINTER_REGNUM || !arc_frame_pointer_required ();
+  return ((to == FRAME_POINTER_REGNUM) || !arc_frame_pointer_needed ());
 }
 
 /* Define the offset between two registers, one to be eliminated, and