Swap order of actor/decoder claiming

Author: ktoso

lib/IRGen/GenDistributed.cpp

@@ -641,12 +641,12 @@ void DistributedAccessor::emit() {
   auto *numWitnessTables = params.claimNext();
   // Reference to a `self` of the actor to be called.
   auto *actorSelf = params.claimNext();
-  // Metadata that represents passed in the invocation decoder.
-  auto *decoderType = params.claimNext();
-
   // Metadata of the distributed actor the accessor is for.
   (void)params.claimNext();
 
+  // Metadata that represents passed in the invocation decoder.
+  auto *decoderType = params.claimNext();
+
   // Witness table for decoder conformance to DistributedTargetInvocationDecoder
   auto *decoderProtocolWitness = params.claimNext();