Slava Pestov 83a3bd2f4b SILGen: Simplify delayed function emission ...

Just as with conformances, we can detect that a delayed function
needs to be added to the queue from 'first principles' rather than
walking the ExternalDefinitions list.

This completely eliminates the ExternalDefinitions walk from SILGen,
which has several advantages:

- It fixes a source of quadratic behavior. In batch mode, type checking
  produces a list of external definitions shared across all primary
  files. Then, SILGen runs once per primary file, building a delayed
  emission map every time.

- It allows SILGen to emit external definitions which only come into
  existence as a result of lazy conformance checking. Previously,
  anything that was added after SILGen performed its walk over the
  external definitions list would not be emitted.

2019-05-18 11:35:05 -04:00

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