Dan Zheng 2a4e1b83fd Implement @dynamicCallable. (#20305) ...

* Implement dynamically callable types (`@dynamicCallable`).

- Implement dynamically callable types as proposed in SE-0216.
  - Dynamic calls are resolved based on call-site syntax.
  - Use the `withArguments:` method if it's defined and there are no
    keyword arguments.
  - Otherwise, use the `withKeywordArguments:` method.
- Support multiple `dynamicallyCall` methods.
  - This enables two scenarios:
    - Overloaded `dynamicallyCall` methods on a single
      `@dynamicCallable` type.
    - Multiple `dynamicallyCall` methods from a `@dynamicCallable`
      superclass or from `@dynamicCallable` protocols.
  - Add `DynamicCallableApplicableFunction` constraint. This, used with
    an overload set, is necessary to support multiple `dynamicallyCall`
    methods.

2018-11-09 09:49:14 -08:00

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