Index: clang/lib/CodeGen/TargetInfo.cpp
===================================================================
--- clang/lib/CodeGen/TargetInfo.cpp
+++ clang/lib/CodeGen/TargetInfo.cpp
@@ -6328,6 +6328,12 @@
     B.addStackAlignmentAttr(8);
     Fn->addAttributes(llvm::AttributeList::FunctionIndex, B);
   }
+
+  unsigned getOpenCLKernelCallingConv() const override {
+    // OpenCL kernels use calling convention from the regular functions
+    // as there is no special support for threads.
+    return llvm::CallingConv::C;
+  }
 };
 
 class WindowsARMTargetCodeGenInfo : public ARMTargetCodeGenInfo {