Xi Ge f55d3ad029 ABI checker: diagnose the missing of @available attributes for added ABIs ...

New ABIs should have an @available attribute to describe the introducing
version. This patch teaches the tool to diagnose its missing.

Decls with @_AlwaysEmitIntoClient are excluded from the blaming lists since
they are essentially available all the time.

rdar://51089418

2019-05-28 16:38:59 -07:00

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