Erik Eckstein 41c17a5b0c IRGen: emit type metadata and (value) witness tables lazily. ...

This gives big code size wins for unused types and also for types, which are never used in a generic context.
Also it reduces the amount of symbols in the symbol table.
The size wins heavily depend on the project. I have seen binary size reductions from 0 to 20% on real world projects.

rdar://problem/30119960

2017-03-10 12:50:43 -08:00

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