Erik Eckstein c11408ea2f IRGen: Don't let the offset of an empty field be undef. ...

If the field address comes from a struct_element_addr which is a result of an optimized `MemoryLayout<S>.offset(of: \.field)` we cannot return undef.
We have to be consistent with `offset(of:)`, which returns 0.
Therefore we need to return the base address of the struct.

rdar://117265274

2024-03-11 15:21:03 +01:00

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