Normative: Fix detach check for TypedArray.prototype.transfer

Closes #98

spec.html

@@ -293,9 +293,12 @@ <h1>ArrayBuffer.prototype.transfer ( [ _newLength_ ] )</h1>
         1. Let _O_ be the *this* value.
         1. Perform ? RequireInternalSlot(_O_, [[ArrayBufferData]]).
         1. If IsSharedArrayBuffer(_O_) is *true*, throw a *TypeError* exception.
-        1. If IsDetachedBuffer(_O_) is *true*, throw a *TypeError* exception.
-        1. If _newLength_ is *undefined*, let _newByteLength_ be _O_.[[ArrayBufferByteLength]].
-        1. Else, let _newByteLength_ be ? ToIntegerOrInfinity(_newLength_).
+        1. If _newLength_ is *undefined*, then
+          1. If IsDetachedBuffer(_O_) is *true*, throw a *TypeError* exception.
+          1. Let _newByteLength_ be _O_.[[ArrayBufferByteLength]].
+        1. Else,
+          1. Let _newByteLength_ be ? ToIntegerOrInfinity(_newLength_).
+          1. If IsDetachedBuffer(_O_) is *true*, throw a *TypeError* exception.
         1. Let _new_ be ? Construct(%ArrayBuffer%, &laquo; 𝔽(_newByteLength_) &raquo;).
         1. NOTE: This method returns a fixed-length ArrayBuffer.
         1. Let _copyLength_ be min(_newByteLength_, _O_.[[ArrayBufferByteLength]]).