A parse-only option is needed for parse performance tracking and the current option also includes semantic analysis.
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Don't allow types conforming to 'Error' or protocol compositions involving 'Error' to be reflected in Objective-C. We still allow bridging conversions, but they are not statically bridged. Fixes SR-2249/rdar://problem/27658940.
Fixes SE-2159 / rdar://problem/27439384.