Slava Pestov 5b6a050e80 IRGen: Fix reflection metadata for zero-sized enum cases ...

If an enum has a payload case with zero size, we treat it as an empty case
for ABI purposes. Unfortunately, this meant that reflection metadata was
incomplete for such cases, with a Mirror reporting that the enum value
had zero children.

Tweak the field type metadata emission slightly to preserve the payload
type for such enum cases.

Fixes <https://bugs.swift.org/browse/SR-12044> / <rdar://problem/58861157>.

2020-02-18 14:16:58 -05:00

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