[clang] [SYCL] The sycl_kernel_entry_point attribute. (PR #111389)

[Tom Honermann via cfe-commits]

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+// RUN: %clang_cc1 -triple x86_64-linux-gnu -std=c++17 -fsyntax-only -fsycl-is-device -verify %s
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tahonermann wrote:

Erich, I'm going to resolve this conversation regarding tests and diagnostics (planned for the next PR). Please unresolve if there is more you want to see in this PR.

https://github.com/llvm/llvm-project/pull/111389