Type printing in, e.g., error messages, is not great for types using the features from the typed function reference proposal currently. For example `(ref null extern)` and `(ref extern)` are both printed as "Externref". The printing should take into account nullability and also the index for reference to a type definition.
<rdar://problem/102472468>
Pull request: https://github.com/WebKit/WebKit/pull/20611
Committed 270988@main (fd124818fa58): <https://commits.webkit.org/270988@main> Reviewed commits have been landed. Closing PR #20611 and removing active labels.