[Sema] Don’t check hasSingleExpressionBody in ConstraintSystem::participatesInInference

It looks like we no longer need this check.

Author: ahoppen

lib/Sema/ConstraintSystem.cpp

@@ -7311,9 +7311,6 @@ bool ConstraintSystem::participatesInInference(ClosureExpr *closure) const {
   if (getAppliedResultBuilderTransform(closure))
     return true;
 
-  if (closure->hasSingleExpressionBody())
-    return true;
-
   if (Options.contains(ConstraintSystemFlags::LeaveClosureBodyUnchecked))
     return false;