patch 9.1.0998: filetype: TI assembly files are not recognized

Problem:  filetype: TI assembly files are not recognized
Solution: inspect '*.sa' and assembly files and detect TI assembly
          files, include filetype plugin and syntax script for TI
          assembly files (Wu, Zhenyu)

closes: #15827

Signed-off-by: Wu, Zhenyu <wuzhenyu@ustc.edu>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index 8f2fb4f..6d64d9d 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -676,7 +676,6 @@
     samba: ['smb.conf'],
     sas: ['file.sas'],
     sass: ['file.sass'],
-    sather: ['file.sa'],
     sbt: ['file.sbt'],
     scala: ['file.scala'],
     scheme: ['file.scm', 'file.ss', 'file.sld', 'file.stsg', 'any/local/share/supertux2/config', '.lips_repl_history'],
@@ -2331,6 +2330,22 @@
   filetype off
 endfunc
 
+func Test_sa_file()
+  filetype on
+
+  call writefile([';* XXX-a.sa: XXX for TI C6000 DSP *;', '.no_mdep'], 'Xfile.sa')
+  split Xfile.sa
+  call assert_equal('tiasm', &filetype)
+  bwipe!
+
+  call writefile(['-- comment'], 'Xfile.sa')
+  split Xfile.sa
+  call assert_equal('sather', &filetype)
+  bwipe!
+
+  filetype off
+endfunc
+
 func Test_sig_file()
   filetype on
 
diff --git a/src/version.c b/src/version.c
index 22efc7e..49a3523 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    998,
+/**/
     997,
 /**/
     996,