Call rb_jit_cont_init() even earlier

To fix https://github.com/ruby/ruby/actions/runs/6581593578/job/17881779994

cont.c

@@ -3443,8 +3443,6 @@ Init_Cont(void)
         }
     }
 
-    rb_jit_cont_init();
-
     rb_cFiber = rb_define_class("Fiber", rb_cObject);
     rb_define_alloc_func(rb_cFiber, fiber_alloc);
     rb_eFiberError = rb_define_class("FiberError", rb_eStandardError);

vm.c

@@ -4110,6 +4110,7 @@ Init_BareVM(void)
     th->vm = vm;
     th->ractor = vm->ractor.main_ractor = rb_ractor_main_alloc();
     Init_native_thread(th);
+    rb_jit_cont_init();
     th_init(th, 0, vm);
 
     rb_ractor_set_current_ec(th->ractor, th->ec);