Use interface types when checking #keyPath. (#7028) #7043
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This avoids a crash when the path refers to a property in another Swift module. https://bugs.swift.org/browse/SR-3714
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#keyPathexpressions was accessing the AST in a way that's no longer supported. This commit changes it to use the new API.#keyPathexpressions. The crash occurred when the expression referenced a property in imported Swift module (as opposed to an imported Objective-C module or the Swift module currently being compiled).