[clang] nonblocking/nonallocating attributes (was: nolock/noalloc) (PR #84983)

[Doug Wyatt via cfe-commits]

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@@ -1435,6 +1435,38 @@ def CXX11NoReturn : InheritableAttr {
   let Documentation = [CXX11NoReturnDocs];
 }
 
+def NonBlocking : TypeAttr {
+  let Spellings = [CXX11<"clang", "nonblocking">,
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dougsonos wrote:

I don't really care either way, but there was a comment suggesting namespacing the GNU-style attribute, just in case GNU were to add their own attribute with the same name.

There is also precedent: `clang_builtin_alias`

https://github.com/llvm/llvm-project/pull/84983