John McCall 9bbbe2c418 Update the metadata-initialization ABI: ...

- Create the value witness table as a separate global object instead
  of concatenating it to the metadata pattern.

- Always pass the metadata to the runtime and let the runtime handle
  instantiating or modifying the value witness table.

- Pass the right layout algorithm version to the runtime; currently
  this is always "Swift 5".

- Create a runtime function to instantiate single-case enums.

Among other things, this makes the copying of the VWT, and any
modifications of it, explicit and in the runtime, which is more
future-proof.

2017-12-21 00:26:37 -05:00

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