Doug Gregor 548e28170a [Driver/Frontend] Thread the target SDK version through to the IR. ...

Teach the driver to pass the SDK version it computes (from the SDK
settings JSON in a Darwin-based platform's SDK) down into the frontend.
The frontend then sets that SDK version in the LLVM module, which
eventually makes its way into the Mach-O file.

Last part of rdar://problem/60332732.

2020-04-15 21:42:28 -07:00

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