[RemoteMirror] Correctly project enums with zero-sized payloads #67257
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I earlier overhauled the enum layout logic to correctly consider enums with generic cases and cases that have zero size. This updates the enum projection logic to use that information as well.
In particular, this fixes a bug where an MPE with zero-sized cases would be incorrectly projected by RemoteMirror (with consequences for the
leaks
tool and lldb).Resolves rdar://111705059