[clang] [clang][SYCL] Add sycl_external attribute and restrict emitting device code (PR #140282)

[Tom Honermann via cfe-commits]

================
@@ -202,6 +202,17 @@ void SemaSYCL::handleKernelAttr(Decl *D, const ParsedAttr 
&AL) {
   handleSimpleAttribute<DeviceKernelAttr>(*this, D, AL);
 }
 
+void SemaSYCL::handleExternalAttr(Decl *D, const ParsedAttr &AL) {
+  auto *ND = cast<NamedDecl>(D);
+  if (!ND->isExternallyVisible()) {
+    Diag(AL.getLoc(), diag::err_sycl_attribute_invalid_linkage)
+        << AL << !isa<FunctionDecl>(ND);
----------------
tahonermann wrote:

The error diagnostic doesn't specify replacement fields, so the redirection 
arguments aren't needed.
```suggestion
    Diag(AL.getLoc(), diag::err_sycl_attribute_invalid_linkage);
```

https://github.com/llvm/llvm-project/pull/140282
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