IRGen: Remove suspiciously looking (duplicate) logic
IRGen: Remove suspiciously looking (duplicate) logic

This should be computed by SignatureExpansion in a more correct way.
The code here seems suspiciously off in the case we have both a direct
return result and one indirect return result.

roambotics/swift,apple/swift,apple/swift,apple/swift,apple/swift,roambotics/swift,roambotics/swift,roambotics/swift,apple/swift,roambotics/swift,apple/swift,roambotics/swift