patch 9.0.1274: FIRRTL files are not recognized

Problem:    FIRRTL files are not recognized.
Solution:   Add a pattern for FIRRTL files. (Amaan Qureshi, closes #11931)

Author: amaanq

runtime/filetype.vim

@@ -671,6 +671,9 @@ autocmd BufRead,BufNewFile *.fnl		setf fennel
 " Fetchmail RC file
 au BufNewFile,BufRead .fetchmailrc		setf fetchmail
 
+" FIRRTL - Flexible Internal Representation for RTL
+au BufNewFile,BufRead *.fir			setf firrtl
+
 " Fish shell
 au BufNewFile,BufRead *.fish			setf fish
 

src/testdir/test_filetype.vim

@@ -197,6 +197,7 @@ let s:filename_checks = {
     \ 'fennel': ['file.fnl'],
     \ 'fetchmail': ['.fetchmailrc'],
     \ 'fgl': ['file.4gl', 'file.4gh', 'file.m4gl'],
+    \ 'firrtl': ['file.fir'],
     \ 'fish': ['file.fish'],
     \ 'focexec': ['file.fex', 'file.focexec'],
     \ 'form': ['file.frm'],

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1274,
 /**/
     1273,
 /**/