llvm.vim: 'musttail' is a keyword too

llvm-svn: 246798
diff --git a/llvm/utils/vim/syntax/llvm.vim b/llvm/utils/vim/syntax/llvm.vim
index 0e2cbd3..8eaa0d6 100644
--- a/llvm/utils/vim/syntax/llvm.vim
+++ b/llvm/utils/vim/syntax/llvm.vim
@@ -56,7 +56,7 @@
 syn keyword llvmKeyword unnamed_addr unordered uwtable volatile weak weak_odr
 syn keyword llvmKeyword x86_fastcallcc x86_stdcallcc x86_thiscallcc
 syn keyword llvmKeyword x86_64_sysvcc x86_64_win64cc zeroext uselistorder
-syn keyword llvmKeyword uselistorder_bb
+syn keyword llvmKeyword uselistorder_bb musttail
 
 " Obsolete keywords.
 syn keyword llvmError  getresult begin end