vim-patch:8.2.0223: some instructions not yet tested

Problem:    Some instructions not yet tested.
Solution:   Disassemble more instructions.  Move tests to a new file.  Compile
            call to s:function().

https://github.com/vim/vim/commit/5cab73f8cca46d831fb9337b176493da2a55ed5d

Co-authored-by: Bram Moolenaar <Bram@vim.org>

src/nvim/eval/userfunc.c

@@ -596,6 +596,7 @@ int get_func_tv(const char *name, int len, typval_T *rettv, char **arg, evalarg_
   return ret;
 }
 
+// fixed buffer length for fname_trans_sid()
 #define FLEN_FIXED 40
 
 /// Check whether function name starts with <SID> or s: