Alex Efremov 83b2ebe8f1 [AutoDiff] Support forward mode differentiation of functions with inout parameters (#33584) ...

Adds forward mode support for `apply` instruction with `inout` arguments.

Example of supported code:
```
func add(_ x: inout Float, _ y: inout Float) -> Float {
  var result = x
  result += y
  return result
}
print(differential(at: 1, 1, in: add)(1, 1)) // prints "2"
```

2020-08-21 17:57:39 -07:00

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