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',

test/old/testdir/test_filetype.vim

@@ -588,6 +588,7 @@ let s:filename_checks = {
     \ 'taskdata': ['pending.data', 'completed.data', 'undo.data'],
     \ 'taskedit': ['file.task'],
     \ 'tcl': ['file.tcl', 'file.tm', 'file.tk', 'file.itcl', 'file.itk', 'file.jacl', '.tclshrc', 'tclsh.rc', '.wishrc'],
+    \ 'tablegen': ['file.td'],
     \ 'teal': ['file.tl'],
     \ 'template': ['file.tmpl'],
     \ 'teraterm': ['file.ttl'],