Slava Pestov 8fab074bb5 AST: Fix regression from SubstFlags::UseErrorTypes removal ...

Note that while the original crasher in the radar is gone, my reduced test
case triggers an IRGen crash on both 5.1 and master because of an unrelated
bug that appears to be related to protocol requirement signatures and
declaration ordering.

Fixes <rdar://problem/54952911>.

2019-09-19 15:50:40 -04:00

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