Pavel Yaskevich 20fc51d4f4 [CSBindings] Open collection before binding parameter only if original argument type failed ...

Instead of always opening argument type represented by a collection
without type variables (to support subtyping when element is a labeled tuple),
let's try original type first and if that fails use a slower path with
indirection which attempts `array upcast`. Doing it this way helps to
propagate contextual information faster which fixes a performance regression.

Resolves: rdar://problem/54580247

2020-02-27 16:26:13 -08:00

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