Joe Groff 7b0045c790 Introduce a "@box T" type for SIL. ...

Represents a heap allocation containing a value of type T, which we'll be able to use to represent the payloads of indirect enum cases, and also improve codegen of current boxes, which generates non-uniqued box metadata on every allocation, which is dumb. No codegen changes or IRGen support yet; that will come later.

Swift SVN r29474

2015-06-18 04:07:03 +00:00

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