Xi Ge bbe5b83de9 Parser: teach canImport to take an additional parameter indicating the minimum module version ...

canImport should be able to take an additional parameter labeled by either version or
underlyingVersion. We need underlyingVersion for clang modules with Swift overlays because they
have separate version numbers. The library users are usually interested in checking the importability
of the underlying clang module instead of its Swift overlay.

Part of rdar://73992299

2021-05-02 17:47:44 -07:00

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