Add .llx


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7732 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/vim/README b/utils/vim/README
index 8dc6b29..6d103b5 100644
--- a/utils/vim/README
+++ b/utils/vim/README
@@ -9,6 +9,7 @@
 
   augroup filetype
     au! BufRead,BufNewFile *.ll     set filetype=llvm
+    au! BufRead,BufNewFile *.llx    set filetype=llvm
   augroup END
 
 * tablegen.vim