vm_eval.c (rb_eval_cmd): use pre-defined idCall

No need to use rb_intern, here.  Reduces size slightly on x86-64:

$ ~/linux/scripts/bloat-o-meter ruby.before ruby.after
add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-31 (-31)
function                                     old     new   delta
rb_eval_cmd                                  813     782     -31

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48418 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,7 @@
+Fri Nov 14 10:23:35 2014  Eric Wong  <e@80x24.org>
+
+	* vm_eval.c (rb_eval_cmd): use pre-defined idCall
+
 Fri Nov 14 09:25:44 2014  Eric Wong  <e@80x24.org>
 
 	* vm_eval.c (rb_yield_splat): add missing GC guard

vm_eval.c

@@ -1481,7 +1481,7 @@ rb_eval_cmd(VALUE cmd, VALUE arg, int level)
 	PUSH_TAG();
 	rb_set_safe_level_force(level);
 	if ((state = EXEC_TAG()) == 0) {
-	    val = rb_funcall2(cmd, rb_intern("call"), RARRAY_LENINT(arg),
+	    val = rb_funcall2(cmd, idCall, RARRAY_LENINT(arg),
 			      RARRAY_CONST_PTR(arg));
 	}
 	POP_TAG();