vim-patch:9.0.1407: TableGen files are not recognized

Problem:    TableGen files are not recognized.
Solution:   Add a pattern for TableGen files. (Amaan Qureshi, closes vim/vim#12156)

b8ef029ee4

Co-authored-by: Amaan Qureshi <amaanq12@gmail.com>

runtime/lua/vim/filetype.lua

@@ -1018,6 +1018,7 @@ local extension = {
   swift = 'swift',
   svh = 'systemverilog',
   sv = 'systemverilog',
+  td = 'tablegen',
   tak = 'tak',
   tal = 'tal',
   task = 'taskedit',