patch 9.1.0769: filetype: MLIR files are not recognized

Problem:  filetype: MLIR files are not recognized
Solution: Detect '*.mlir' files as mlir filetype,
          include a mlir filetype plugin
          (Wu, Zhenyu)

closes: #15826

Signed-off-by: Wu, Zhenyu <wuzhenyu@ustc.edu>
Signed-off-by: Christian Brabandt <cb@256bit.org>

Author: Freed-Wu

runtime/filetype.vim

@@ -576,6 +576,9 @@ au BufNewFile,BufRead lynx.cfg			setf lynx
 " LyRiCs
 au BufNewFile,BufRead *.lrc			setf lyrics
 
+" MLIR
+au BufNewFile,BufRead *.mlir			setf mlir
+
 " Modula-3 configuration language (must be before *.cfg and *makefile)
 au BufNewFile,BufRead *.quake,cm3.cfg		setf m3quake
 au BufNewFile,BufRead m3makefile,m3overrides	setf m3build

runtime/ftplugin/mlir.vim

@@ -0,0 +1,10 @@
+" Vim filetype plugin file
+" Language:	MLIR
+
+if exists("b:did_ftplugin") | finish | endif
+let b:did_ftplugin = 1
+
+setl comments=:///,://
+setl commentstring=//\ %s
+
+let b:undo_ftplugin = "setl commentstring< comments<"

src/testdir/test_filetype.vim

@@ -479,6 +479,7 @@ def s:GetFilenameChecks(): dict<list<string>>
     mgp: ['file.mgp'],
     mib: ['file.mib', 'file.my'],
     mix: ['file.mix', 'file.mixal'],
+    mlir: ['file.mlir'],
     mma: ['file.nb', 'file.wl'],
     mmp: ['file.mmp'],
     modconf: ['/etc/modules.conf', '/etc/modules', '/etc/conf.modules', '/etc/modprobe.file', 'any/etc/conf.modules', 'any/etc/modprobe.file', 'any/etc/modules', 'any/etc/modules.conf'],

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    769,
 /**/
     768,
 /**/