Undo accidental change from microsoft#39772 (microsoft#39779)

* Undo accidental change

* Delete test

Author: andrewbranch

src/compiler/checker.ts

@@ -33446,8 +33446,6 @@ namespace ts {
                         reportTypeNotIterableError(errorNode, type, !!(use & IterationUse.AllowsAsyncIterablesFlag));
                         errorNode = undefined;
                     }
-                    setCachedIterationTypes(type, cacheKey, noIterationTypes);
-                    return undefined;
                 }
                 else {
                     allIterationTypes = append(allIterationTypes, iterationTypes);

tests/baselines/reference/destructuringArrayBindingPatternAndAssignment4.errors.txt

@@ -25,11 +25,11 @@ declare function f2<T, R, S>(gen: () => Generator<R, T, S> | AsyncGenerator<R, T
 f2<0, 0, 1>(async function* () {
 >f2<0, 0, 1>(async function* () {	const a = yield 0;	return 0;}) : void
 >f2 : <T, R, S>(gen: () => Generator<R, T, S> | AsyncGenerator<R, T, S>) => void
->async function* () {	const a = yield 0;	return 0;} : () => AsyncGenerator<0, 0, 1 | undefined>
+>async function* () {	const a = yield 0;	return 0;} : () => AsyncGenerator<0, 0, 1>
 
 	const a = yield 0;
->a : 1 | undefined
->yield 0 : 1 | undefined
+>a : 1
+>yield 0 : 1
 >0 : 0
 
 	return 0;