Rollup merge of #72890 - davidtwco:issue-66202-normalize-and-transparent-improper-ctypes, r=varkor

improper ctypes: normalize return types and transparent structs

Fixes #66202.

See each commit individually (except the first which adds a test) for more detailed explanations on the changes made.

In summary, this PR ensures that return types are normalized before being checked for FFI-safety, and that transparent newtype wrappers are FFI-safe if the type being wrapped is FFI-safe (often true previously, but not if, after substitution, all types in a transparent newtype were zero sized).

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