Fix ARM bootstrap failure due to an odd warning:

/src/gcc/gcc/config/arm/arm-builtins.c: In function 'rtx_def* arm_expand_builtin(tree, rtx, rtx, machine_mode, int)':
/src/gcc/gcc/config/arm/arm-builtins.c:3056:46: error: type qualifiers ignored on cast result type [-Werror=ignored-qualifiers]
     if (d->code == (const enum arm_builtins) fcode)
                                              ^~~~~

Avoid the warning by removing const, and bootstrap is OK again.

Committed as trivial patch.

    gcc/
	* config/arm/arm-builtins.c (arm_expand_builtin): Remove const.

From-SVN: r248686

gcc/ChangeLog

+2017-05-30  Wilco Dijkstra  <wdijkstr@arm.com>
+
+	* config/arm/arm-builtins.c (arm_expand_builtin): Remove const.
+
 2017-05-30  Richard Biener  <rguenther@suse.de>
 
 	* tree-vectorizer.h (struct _stmt_vec_info): Add reduc_type

gcc/config/arm/arm-builtins.c

@@ -3053,15 +3053,15 @@ arm_expand_builtin (tree exp,
     }
 
   for (i = 0, d = bdesc_2arg; i < ARRAY_SIZE (bdesc_2arg); i++, d++)
-    if (d->code == (const enum arm_builtins) fcode)
+    if (d->code == (enum arm_builtins) fcode)
       return arm_expand_binop_builtin (d->icode, exp, target);
 
   for (i = 0, d = bdesc_1arg; i < ARRAY_SIZE (bdesc_1arg); i++, d++)
-    if (d->code == (const enum arm_builtins) fcode)
+    if (d->code == (enum arm_builtins) fcode)
       return arm_expand_unop_builtin (d->icode, exp, target, 0);
 
   for (i = 0, d = bdesc_3arg; i < ARRAY_SIZE (bdesc_3arg); i++, d++)
-    if (d->code == (const enum arm_builtins) fcode)
+    if (d->code == (enum arm_builtins) fcode)
       return arm_expand_ternop_builtin (d->icode, exp, target);
 
   /* @@@ Should really do something sensible here.  */