Max Desiatov 6d042aeb4a Embedded WASI: fix storeEnumTagSinglePayload type mismatch (#83480) ...

This is a follow up to https://github.com/swiftlang/swift/pull/80862, where `storeEnumTagSinglePayload` in a special implementation of `ResultTypeInfo` for Embedded Swift had a mismatching number of arguments. The actual declaration of it in `ABI/ValueWitness.def` clearly includes one more argument.

```
/// void (*storeEnumTagSinglePayload)(T* enum, UINT_TYPE whichCase,
///                                   UINT_TYPE emptyCases, M *self);
/// Given uninitialized memory for an instance of a single payload enum with a
/// payload of this witness table's type (e.g Optional<ThisType>), store the
/// tag.
FUNCTION_VALUE_WITNESS(storeEnumTagSinglePayload,
                       StoreEnumTagSinglePayload,
                       VOID_TYPE,
                       (MUTABLE_VALUE_TYPE, UINT_TYPE, UINT_TYPE, TYPE_TYPE))
```

This function type mismatch is illegal when targeting Wasm and traps at run time.

Similarly to #80862, we're passing `nullptr` as the newly added argument, which is equivalent to the existing behavior on other platforms.

rdar://157219474

2025-08-01 15:38:59 -07:00

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