Compile frames during compilation instead of parsing.

PiperOrigin-RevId: 625717564
Change-Id: Ib82230f6cb423bb3091efd04a7fa0b1411e7cdf1

src/user/user_model.cc

@@ -3118,7 +3118,7 @@ void mjCModel::TryCompile(mjModel*& m, mjData*& d, const mjVFS* vfs) {
 
   // compile objects in kinematic tree
   for (int i=0; i<bodies.size(); i++) {
-    bodies[i]->Compile();  // also compiles joints, geoms, sites, cameras, lights
+    bodies[i]->Compile();  // also compiles joints, geoms, sites, cameras, lights, frames
   }
 
   // compile all other objects except for keyframes