Slava Pestov 6bb5b7ebcc SIL: Serialize conformances synthesized by the ClangImporter ...

The witness table had shared linkage, but we weren't serializing them,
which would cause linking errors if we emitted a reference to such a
witness table from a different module than the one where it was first
defined, as a result of deserializing and optimizing SIL.

This issue was introduced when SIL witness table serialization was
made conditional on the -sil-serialize-witness-tables flag, which is
normally only enabled for the standard library.

When the flag was added, existing tests were updated to pass the
flag, which masked the issue. Remove the flag from existing tests,
ensure that imported witness tables are still [serialized], and add
a new test specifically for the behavior enabled by this flag.

2017-09-15 00:24:52 -07:00

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