Devin Coughlin 8b14600372 [ClangImporter] Refactor availability attribute importing logic. NFC. ...

Refactor the PlatformAvailability logic for determining
which Clang availability attributes are relevant when importing. The goal
is to separate the logic for attribute relevance for a given platform from
the logic to determine whether a deprecated attribute should be imported as
unavailable in Swift.

This also makes it possible for the "deprecated-as-unavailable" logic to
refer to the underlying Clang declaration, which is functionality that will
be used in a later commit.

This commit has no intended functional change.

Part of rdar://problem/48348822

2019-03-03 14:29:50 -08:00

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