[Profiler] NFC: Constify `LoadedCounts`
[Profiler] NFC: Constify `LoadedCounts`

glessard/swift,apple/swift,apple/swift,benlangmuir/swift,roambotics/swift,benlangmuir/swift,benlangmuir/swift,glessard/swift,benlangmuir/swift,apple/swift,glessard/swift,roambotics/swift,glessard/swift,benlangmuir/swift,apple/swift,apple/swift,roambotics/swift,benlangmuir/swift,roambotics/swift,glessard/swift,glessard/swift,roambotics/swift,apple/swift,roambotics/swift