Xi Ge ed13a2f0e4 ABI checker: require explicit @available attributes for new APIs ...

Before this change, the ABI checker didn't complain about missing @available
attributes on new APIs if the enclosing scopes of new APIs have
availability information. Instead, we should require explicit @available attributes
for new APIs to prevent them inheriting wrong availability information from a
preexisting scope.

rdar://81719628

2021-08-10 11:24:08 -07:00

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