Normative: Remove detached array buffer check prior to calling CloneA…

…rrayBuffer

This aligns the detached array buffer checks in step 18 and 19 of 22.2.4.3.

Fixes #1002

spec.html

@@ -33413,7 +33413,6 @@ <h1>_TypedArray_ ( _typedArray_ )</h1>
           1. Else,
             1. Let _bufferConstructor_ be %ArrayBuffer%.
           1. If SameValue(_elementType_, _srcType_) is *true*, then
-            1. If IsDetachedBuffer(_srcData_) is *true*, throw a *TypeError* exception.
             1. Let _data_ be ? CloneArrayBuffer(_srcData_, _srcByteOffset_, _byteLength_, _bufferConstructor_).
           1. Else,
             1. Let _data_ be ? AllocateArrayBuffer(_bufferConstructor_, _byteLength_).