Joe Groff cabaa0a51a SIL: Introduce lowered SILLayouts. ...

This gives us a concept we can eventually use to cache the lowered physical layout of fragile structs and classes, and more immediately, concretize the layout of closure boxes in a way that lets us represent the capture of generic environments and multiple captured values without compromising the "nominal" nature of box layouts. To start exercising the basic implementation, change the representation of SILBoxType to be in terms of a SILLayout, though avoid any immediate functionality change by preserving the single-boxed-type interface for now.

2016-10-21 14:19:56 -07:00

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