[ConstraintSystem] Result builder transformed closures always participate in inference

Author: xedin

lib/Sema/ConstraintSystem.cpp

@@ -6930,6 +6930,9 @@ bool ConstraintSystem::isArgumentGenericFunction(Type argType, Expr *argExpr) {
 }
 
 bool ConstraintSystem::participatesInInference(ClosureExpr *closure) const {
+  if (getAppliedResultBuilderTransform(closure))
+    return true;
+
   if (closure->hasSingleExpressionBody())
     return true;