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

[Tom Honermann via cfe-commits]

================
@@ -12251,6 +12264,9 @@ bool Sema::CheckFunctionDeclaration(Scope *S, 
FunctionDecl *NewFD,
   if (NewFD->hasAttr<SYCLKernelEntryPointAttr>())
     SYCL().CheckSYCLEntryPointFunctionDecl(NewFD);
 
+  if (NewFD->hasAttr<SYCLExternalAttr>())
+    SYCL().CheckSYCLExternalFunctionDecl(NewFD);
----------------
tahonermann wrote:

The checks include checking for linkage which I don't think is necessarily 
computed at the time the attribute is visited.

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