patch 8.1.1996: more functions can be used as methods

Problem:    More functions can be used as methods.
Solution:   Make various functions usable as a method.
diff --git a/src/testdir/test_quickfix.vim b/src/testdir/test_quickfix.vim
index 7a1f96d..402a96d 100644
--- a/src/testdir/test_quickfix.vim
+++ b/src/testdir/test_quickfix.vim
@@ -711,7 +711,7 @@
       " NOTE: problem 1:
       " intentionally not setting 'lnum' so that the quickfix entries are not
       " valid
-      call setloclist(0, qflist, ' ')
+      eval qflist->setloclist(0, ' ')
     endfor
 
     " Test A
@@ -1515,7 +1515,7 @@
 
 func Test_setqflist_invalid_nr()
   " The following command used to crash Vim
-  call setqflist([], ' ', {'nr' : $XXX_DOES_NOT_EXIST})
+  eval []->setqflist(' ', {'nr' : $XXX_DOES_NOT_EXIST})
 endfunc
 
 func Test_quickfix_set_list_with_act()