[SAB] Fix {newtarget-prototype-is-not-object,proto-from-ctor-realm} tests

src/js/typedarray.js

Index: src/js/typedarray.js
diff --git a/src/js/typedarray.js b/src/js/typedarray.js
index 4cd678e03f9b223d5dc423dcbc5f2f8e63b341d1..5b8d5926a989a6c8327af279945e8c25f88f5180 100644
--- a/src/js/typedarray.js
+++ b/src/js/typedarray.js
@@ -147,7 +147,9 @@ function NAMEConstructByTypedArray(obj, typedArray) {
   var byteLength = %_ArrayBufferViewGetByteLength(typedArray);
   var newByteLength = length * ELEMENT_SIZE;
   %typed_array_construct_by_array_like(obj, typedArray, length, ELEMENT_SIZE);
-  var bufferConstructor = SpeciesConstructor(srcData, GlobalArrayBuffer);
+  var bufferConstructor = (IS_SHAREDARRAYBUFFER(srcData))

[adamk, 2017/04/07 17:24:21]

Nit: no need for the extra parens (the macros already have parens to avoid
problems).

Also, can you add a comment here with a short explanation of why this check
needs to be here? It looks pretty without any context.

[binji, 2017/04/07 18:55:36]

Done.

+                              ? GlobalArrayBuffer
+                              : SpeciesConstructor(srcData, GlobalArrayBuffer);
   var prototype = bufferConstructor.prototype;
   // TODO(littledan): Use the right prototype based on bufferConstructor's realm
   if (IS_RECEIVER(prototype) && prototype !== GlobalArrayBufferPrototype) {