patch 8.2.4040: keeping track of allocated lines is too complicated

Problem:    Keeping track of allocated lines in user functions is too
            complicated.
Solution:   Instead of freeing individual lines keep them all until the end.

src/testdir/test_vim9_func.vim

@@ -1757,6 +1757,21 @@ def Test_nested_function_with_args_split()
   CheckScriptFailure(lines, 'E1173: Text found after endfunction: BBBB')
 enddef
 
+def Test_error_in_function_args()
+  var lines =<< trim END
+      def FirstFunction()
+        def SecondFunction(J  =
+        # Nois
+        # one
+         
+         enddef|BBBB
+      enddef
+      # Compile all functions
+      defcompile
+  END
+  CheckScriptFailure(lines, 'E488:')
+enddef
+
 def Test_return_type_wrong()
   CheckScriptFailure([
         'def Func(): number',
@@ -2048,7 +2063,6 @@ func Test_free_dict_while_in_funcstack()
 endfunc
 
 def Run_Test_free_dict_while_in_funcstack()
-
   # this was freeing the TermRun() default argument dictionary while it was
   # still referenced in a funcstack_T
   var lines =<< trim END