Adrian Prantl 97cbd3b1cf Deserialize Swift compatibility version in CompilerInvocation::loadFromSerializedAST() ...

LLDB needs the -swift-version because the -D__swift__ macro affects
how Clang modules are built. This currently has the really odd effect
that when debugging a Swift program that is not using the very latest
Swift version, the first "po" takes several seconds, because the
module cache needs to be rebuilt.

rdar://problem/40241256

2018-08-28 13:04:27 -07:00

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