John McCall d61d966451 Use ConstantInitBuilder in most kinds of metadata emission. ...

This is NFC in intent, but I had to restructure the code to emit more
of the lists "inline", which means I inevitably altered some IRGen
emission patterns in ways that are visible to tests:

- GenClass emits property/ivar/whatever descriptors in a somewhat
  different order.

- An ext method type list is now emitted as just an array, not a struct
  containing only that array.

- Protocol descriptors are no longer emitted as packed structs.

I was sorely tempted to stop using packed structs for all the metadata
emission, but didn't really want to update that many tests in one go.

2017-03-06 14:18:47 -05:00

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