Slava Pestov 1831b5471e SIL: Clean up 'early serialization' a bit ...

- Clear the 'serialized' flag on witness tables and vtables
  after serialization, not just functions. This fixes SIL
  verifier failures if post-serialization SIL is printed
  out and parsed back in.

- Clear the 'serialized' flag when deserializing functions,
  witness tables and vtables in a module that has already
  been serialized. This fixes SIL verifier failures if
  we deserialize more declarations after serializing SIL.

We were seeing SIL verifier failures on bots that run the
tests with the stdlib built with non-standard flags.

Unfortunately I don't have a reduced test case that would
fail in PR testing without these fixes.

Fixes <rdar://problem/36682929>.

2018-01-21 01:35:13 -08:00

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