[clang] [clang] Fix GNU spellings of lifetimebound/lifetime_capture_by (PR #192070)

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@@ -734,6 +734,13 @@ static void distributeTypeAttrsFromDeclarator(TypeProcessingState &state,
       continue;
 
     switch (attr.getKind()) {
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Sirraide wrote:

I find it hard to believe that adding cases here would be the right way of doing this; I would have thought that you’d have to modify something in `Attr.td` to get this to work; should these attributes perhaps be `DeclOrTypeAttr`s?

CC @erichkeane 

https://github.com/llvm/llvm-project/pull/192070