[swift-evolution] Proposal: helpers for initializing properties of same name as parameters

[Tal Atlas]

There’s lots of boilerplate of initializing structs with stored properties
and initializer parameters. I’d like to create a syntax for alleviating
that in the 90% case.

```swift
struct Foo {
    let bar: String
    let baz: Int

    init(self.bar: String = "default", counter self.baz: Int) {
    }
}
```

This would be identical to:
```swift
struct Foo {
    let bar: String
    let baz: Int

    init(bar: String = "default", counter baz: Int) {
        self.bar = bar
        self.baz = baz
    }
}
```
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