Remove redundant check in byteLength

Author: syg

spec.html

@@ -671,7 +671,7 @@ <h1>get %TypedArray%.prototype.byteLength</h1>
         1. Perform ? RequireInternalSlot(_O_, [[TypedArrayName]]).
         1. Assert: _O_ has a [[ViewedArrayBuffer]] internal slot.
         1. Let _buffer_ be _O_.[[ViewedArrayBuffer]].
-        1. If IsDetachedBuffer(_buffer_) is *true*, return *+0*<sub>𝔽</sub>.
+        1. <del>If IsDetachedBuffer(_buffer_) is *true*, return *+0*<sub>𝔽</sub></del>.
         1. <ins>Let _getBufferByteLength_ be MakeIdempotentArrayBufferByteLengthGetter(~SeqCst~).</ins>
         1. Let _size_ be <del>_O_.[[ByteLength]]</del><ins>IntegerIndexedObjectByteLength(_O_, _getBufferByteLength_)</ins>.
         1. Return 𝔽(_size_).