AMDGPU: Add AMDGPU_HS calling convention

Reviewers: arsenm, nhaehnle

Subscribers: mehdi_amini, kzhuravl, wdng, yaxunl, dstuttard, tpr, llvm-commits, t-tye

Differential Revision: https://reviews.llvm.org/D32644

llvm-svn: 301930
diff --git a/llvm/lib/IR/Verifier.cpp b/llvm/lib/IR/Verifier.cpp
index 29e785b..65e1245 100644
--- a/llvm/lib/IR/Verifier.cpp
+++ b/llvm/lib/IR/Verifier.cpp
@@ -1984,6 +1984,7 @@
            "Calling convention requires void return type", &F);
     LLVM_FALLTHROUGH;
   case CallingConv::AMDGPU_VS:
+  case CallingConv::AMDGPU_HS:
   case CallingConv::AMDGPU_GS:
   case CallingConv::AMDGPU_PS:
   case CallingConv::AMDGPU_CS: