Joe Groff 1e2bda9ea0 Extensions to SILBoxType to represent captures. ...

- Add a `[reflection]` bit to `alloc_box` instructions, to indicate that a box
  should be allocated with reflection metadata attached.
- Add a `@captures_generics` attribute to SILLayouts, to indicate a type layout
  that captures the generic arguments it's substituted with, meaning it can
  recreate the generic environment without additional ABI-level arguments, like
  a generic partial application can.

2022-04-21 12:51:46 -07:00

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