fix compile error.

* insns.def (trace): use cast `flag` to pass compilation with clang on MacOSX.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58394 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

insns.def

@@ -732,7 +732,7 @@ trace
 {
     rb_event_flag_t flag = (rb_event_flag_t)nf;
 
-    vm_dtrace(nf, th);
+    vm_dtrace(flag, th);
     EXEC_EVENT_HOOK(th, flag, GET_SELF(), 0, 0, 0 /* id and klass are resolved at callee */,
 		    (flag & (RUBY_EVENT_RETURN | RUBY_EVENT_B_RETURN)) ? TOPN(0) : Qundef);
 }