Jordan Rose 88405bc2f3 [ModuleInterface] Honor -disable-modules-validate-system-headers ...

The point of this flag is to avoid re-checking the whole SDK on every
build, since under many circumstances you can assume it hasn't
changed. That worked for Clang modules, but Swift cached modules also
end up with dependencies that shouldn't be updated.

rdar://problem/53279521

2019-07-18 18:38:31 -07:00

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