[cfe-commits] patch: serialize Sema::UndefinedInternals in PCH

[Nick Lewycky]

This patch fixes a problem where the PCH fails to faithfully represent the
state of Sema, causing it to drop some -Wundefined-internal diagnostics
across PCH boundaries.

While there I noticed that KnownNamespaces was being emitted in an
indeterminate order and added code to sort them deterministically.

Please review!

Nick
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