Update uwtable vim color!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137806 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/vim/llvm.vim b/utils/vim/llvm.vim
index 23802f4..c9ee28e 100644
--- a/utils/vim/llvm.vim
+++ b/utils/vim/llvm.vim
@@ -51,7 +51,7 @@
 syn keyword llvmKeyword x86_stdcallcc x86_fastcallcc
 syn keyword llvmKeyword ptx_kernel ptx_device
 syn keyword llvmKeyword signext zeroext inreg sret nounwind noreturn
-syn keyword llvmKeyword nocapture byval nest readnone readonly noalias
+syn keyword llvmKeyword nocapture byval nest readnone readonly noalias uwtable
 syn keyword llvmKeyword inlinehint noinline alwaysinline optsize ssp sspreq
 syn keyword llvmKeyword noredzone noimplicitfloat naked alignstack
 syn keyword llvmKeyword module asm align tail to