Sema: Fix availability of inherited designated initializers, part 2 [4.2] #18037
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Description: When a class inherits designated initializers from the superclass, we synthesize them. The superclass initializer might be less available than the superclass itself, so we have to inherit availability. We need to intersect this availability with all parent scopes of the subclass, to avoid a "declaration cannot be more available than its surrounding scope" error attached to an unknown source location.
Risk: Low, this adds the outer scope walk to the existing fix.
Tested: New test added.
Radar: rdar://problem/40853731
Reviewed by: @jrose-apple