Add ret instruction to PTX backend

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@114788 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AsmParser/LLToken.h b/lib/AsmParser/LLToken.h
index 61f93a4..8a8663e 100644
--- a/lib/AsmParser/LLToken.h
+++ b/lib/AsmParser/LLToken.h
@@ -72,6 +72,7 @@
     kw_x86_stdcallcc, kw_x86_fastcallcc, kw_x86_thiscallcc,
     kw_arm_apcscc, kw_arm_aapcscc, kw_arm_aapcs_vfpcc,
     kw_msp430_intrcc,
+    kw_ptx_kernel, kw_ptx_device,
 
     kw_signext,
     kw_zeroext,