Michael Gottesman 69a03c93f9 [move-only] Ban partial reinitialization after consuming a value. ...

This is similar to our ban on partial consuming a value for this release. The
reason for this is that, one can achieve a similar affect as partial consumption
via a consumption of the entire value and then a partial reinitialization. Example:

```swift
struct X : ~Copyable { var i = 5, var i2 = Klass() }
var x = X()
_ = consume x
x.i = 5
```

in the case above, we now have a value that is in a partially initialized state.

We still allow for move only types to have their fields initialized as long as
there is an intervening init.

rdar://111498740

2023-07-05 20:26:26 -07:00

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