[3.0] Fix casting to Measurement and introduce custom AnyHashable support #4801
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This PR fixes a crash-on-valid in the compiler where we had an 'unreachable' assertion on valid code that attempts to perform a bridging cast from
NSMeasurement
toMeasurement
. While that fix is good in an of itself, it also unblocked customAnyHashable
support forNSMeasurement
.Resolves rdar://problem/27539951.