8266497: Remove unnecessary EMCP liveness indication

Reviewed-by: iklam, dholmes, sspitsyn

src/hotspot/share/oops/method.cpp

@@ -2230,8 +2230,6 @@ void Method::set_on_stack(const bool value) {
   if (value && !already_set) {
     MetadataOnStackMark::record(this);
   }
-  assert(!value || !is_old() || is_obsolete() || is_running_emcp(),
-         "emcp methods cannot run after emcp bit is cleared");
 }
 
 // Called when the class loader is unloaded to make all methods weak.