[clang] [llvm] [clang] Simplify device kernel attributes (PR #137882)

[Aaron Ballman via llvm-commits]

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@@ -1538,11 +1533,32 @@ def CUDAShared : InheritableAttr {
 }
 def : MutualExclusions<[CUDAConstant, CUDAShared, HIPManaged]>;
 
-def SYCLKernel : InheritableAttr {
-  let Spellings = [Clang<"sycl_kernel">];
-  let Subjects = SubjectList<[FunctionTmpl]>;
-  let LangOpts = [SYCLDevice];
+def DeviceKernel : DeclOrTypeAttr {
+  let Spellings = [Clang<"device_kernel">, Clang<"sycl_kernel">,
+                   Clang<"nvptx_kernel">, Clang<"amdgpu_kernel">,
+                   CustomKeyword<"__kernel">, CustomKeyword<"kernel">];
   let Documentation = [SYCLKernelDocs];
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AaronBallman wrote:

I suspect we'll need to update the documentation because it's now going to list all of the various kernel attributes under SYCL kernel docs.

https://github.com/llvm/llvm-project/pull/137882