Move the responsibility for adding the special direct continuation

arguments to the CallEmission.

Author: rjmccall

lib/IRGen/GenCall.cpp

@@ -3341,6 +3341,14 @@ class AsyncCallEmission final : public CallEmission {
       break;
     }
     }
+
+    // If we're passing the continuation directly, add those implicit
+    // arguments.
+    if (getCallee().shouldPassContinuationDirectly()) {
+      asyncExplosion.add(getResumeFunctionPointer());
+      asyncExplosion.add(getAsyncContext());
+    }
+
     super::setArgs(asyncExplosion, false, witnessMetadata);
 
     auto layout = getAsyncContextLayout();

lib/IRGen/IRGenSIL.cpp

@@ -3954,11 +3954,6 @@ void IRGenSILFunction::visitFullApplySite(FullApplySite site) {
     }
   }
 
-  if (calleeFP.shouldPassContinuationDirectly()) {
-    llArgs.add(emission->getResumeFunctionPointer());
-    llArgs.add(emission->getAsyncContext());
-  }
-
   // Add all those arguments.
   emission->setArgs(llArgs, false, &witnessMetadata);