Alexis Laferrière 71f116ca6f [Serialization] Recover in opaque type logic ...

If the underlying type of an opaque type references an
implementation-only imported type, drop the underlying type information.

Without this fix, once we enable deserialization safety, we see crashes
or dropped decls in more existing tests:

IRGen/mangle-opaque-return-type.swift
IRGen/opaque_result_type_private_underlying.swift
Serialization/Recovery/implementation-only-opaque-type.swift

rdar://103238451

2023-01-12 09:11:10 -08:00

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