Normative: avoid mostly-redundant await in async yield* (#2819)

spec.html

@@ -45130,7 +45130,7 @@ <h1>
         </dl>
         <emu-alg>
           1. Let _generatorKind_ be GetGeneratorKind().
-          1. If _generatorKind_ is ~async~, return ? AsyncGeneratorYield(_value_).
+          1. If _generatorKind_ is ~async~, return ? AsyncGeneratorYield(? Await(_value_)).
           1. Otherwise, return ? GeneratorYield(CreateIterResultObject(_value_, *false*)).
         </emu-alg>
       </emu-clause>
@@ -45481,7 +45481,6 @@ <h1>
           1. Assert: _genContext_ is the execution context of a generator.
           1. Let _generator_ be the value of the Generator component of _genContext_.
           1. Assert: GetGeneratorKind() is ~async~.
-          1. Set _value_ to ? Await(_value_).
           1. Let _completion_ be NormalCompletion(_value_).
           1. Assert: The execution context stack has at least two elements.
           1. Let _previousContext_ be the second to top element of the execution context stack.