vim-patch:8.2.3617: ":verbose pwd" does not mention 'autochdir' was applied

Problem:    ":verbose pwd" does not mention 'autochdir' was applied.
Solution:   Remember the last chdir was done by 'autochdir'.  (issue vim/vim#9142)
0526815c15

src/nvim/buffer.c

@@ -1588,6 +1588,7 @@ void do_autochdir(void)
         && curbuf->b_ffname != NULL
         && vim_chdirfile(curbuf->b_ffname, kCdCauseAuto) == OK) {
       post_chdir(kCdScopeGlobal, false);
+      last_chdir_reason = "autochdir";
       shorten_fnames(true);
     }
   }