patch 9.0.1140: cannot call an object method in a compiled function

Problem:    Cannot call an object method in a compiled function.
Solution:   Compile the instructins to invoke an object method.

src/testdir/test_vim9_class.vim

@@ -329,6 +329,7 @@ def Test_class_object_member_access()
 
       class MyCar
         this.make: string
+        this.age = 5
 
         def new(make_arg: string)
           this.make = make_arg
@@ -337,6 +338,9 @@ def Test_class_object_member_access()
         def GetMake(): string
           return $"make = {this.make}"
         enddef
+        def GetAge(): number
+          return this.age
+        enddef
       endclass
 
       var c = MyCar.new("abc")
@@ -347,6 +351,12 @@ def Test_class_object_member_access()
 
       var c2 = MyCar.new("123")
       assert_equal('make = 123', c2.GetMake())
+
+      def CheckCar()
+        assert_equal("make = def", c.GetMake())
+        assert_equal(5, c.GetAge())
+      enddef
+      CheckCar()
   END
   v9.CheckScriptSuccess(lines)