use new ReturnCompletion AO

spec.html

@@ -23490,7 +23490,7 @@ <h1>
         1. Perform ? FunctionDeclarationInstantiation(_functionObject_, _argumentsList_).
         1. Perform ? Evaluation of |FunctionStatementList|.
         1. NOTE: If the previous step resulted in a normal completion, then evaluation finished by proceeding past the end of the |FunctionStatementList|.
-        1. Return Completion Record { [[Type]]: ~return~, [[Value]]: *undefined*, [[Target]]: ~empty~ }.
+        1. Return ReturnCompletion(*undefined*).
       </emu-alg>
     </emu-clause>
 
@@ -24881,7 +24881,7 @@ <h1>
         1. Assert: _functionObject_ is a synthetic function created by ClassStaticBlockDefinitionEvaluation step <emu-xref href="#step-synthetic-class-static-block-fn"></emu-xref>.
         1. Perform ! FunctionDeclarationInstantiation(_functionObject_, « »).
         1. Perform ? Evaluation of |ClassStaticBlockStatementList|.
-        1. Return Completion Record { [[Type]]: ~return~, [[Value]]: *undefined*, [[Target]]: ~empty~ }.
+        1. Return ReturnCompletion(*undefined*).
       </emu-alg>
     </emu-clause>