[clang] [clang][SYCL] Handle cdecl variadic functions for SYCL device (PR #194922)

[Mariya Podchishchaeva via cfe-commits]

================
@@ -0,0 +1,45 @@
+// RUN: %clang_cc1 -isystem %S/Inputs/ -fsycl-is-device -triple spirv64 -aux-triple x86_64-pc-windows-msvc -fsyntax-only -verify %s
+// RUN: %clang_cc1 -isystem %S/Inputs/ -fsycl-is-device -triple spirv64 -fsyntax-only -verify %s
+
----------------
Fznamznon wrote:

I don't think this is required by community guidelines. I think this is our downstream guideline which I suggested some time ago due to high number of low quality tests. This test is simple enough to not have this description IMO.

https://github.com/llvm/llvm-project/pull/194922