[clang] [SYCL] Basic diagnostics for the sycl_kernel_entry_point attribute. (PR #120327)

[Tom Honermann via cfe-commits]

================
@@ -1550,6 +1550,8 @@ NamedDecl *Sema::ActOnNonTypeTemplateParameter(Scope *S, Declarator &D,
     IdResolver.AddDecl(Param);
   }
 
+  ProcessDeclAttributes(S, Param, D);
----------------
tahonermann wrote:

This was needed to ensure diagnostics were issued for a few of the tests. I think this was a simple omission. I appreciate wanting other eyes on it though and we could move this to a separate PR. Note that this checks attributes on the types of non-type template arguments; from the C++ standard perspective, this is like any other type specifier.

https://github.com/llvm/llvm-project/pull/120327