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)
diff --git a/runtime/filetype.vim b/runtime/filetype.vim
index 7810077..6fa16a7 100644
--- a/runtime/filetype.vim
+++ b/runtime/filetype.vim
@@ -671,6 +671,9 @@
 " 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
 
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index 03fd235..101bdfd 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -197,6 +197,7 @@
     \ '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'],
diff --git a/src/version.c b/src/version.c
index ff2105c..8facdc4 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1274,
+/**/
     1273,
 /**/
     1272,