Introduce a BuiltinsConstructStub that sets up new.target and does a [[call]] per ES6 9.3.2

src/js/typedarray.js

Index: src/js/typedarray.js
diff --git a/src/js/typedarray.js b/src/js/typedarray.js
index db8dabe867dd15793a5b2f0381bb2a1e7afae03b..c25966ce992f8a8a0e34f696d6e42d57d212fe07 100644
--- a/src/js/typedarray.js
+++ b/src/js/typedarray.js
@@ -765,31 +765,33 @@ TYPED_ARRAYS(SETUP_TYPED_ARRAY)
 // --------------------------- DataView -----------------------------
 
 function DataViewConstructor(buffer, byteOffset, byteLength) { // length = 3
-  if (%_IsConstructCall()) {
-    // TODO(binji): support SharedArrayBuffers?
-    if (!IS_ARRAYBUFFER(buffer)) throw MakeTypeError(kDataViewNotArrayBuffer);
-    if (!IS_UNDEFINED(byteOffset)) {
-      byteOffset = ToPositiveInteger(byteOffset, kInvalidDataViewOffset);
-    }
-    if (!IS_UNDEFINED(byteLength)) {
-      byteLength = TO_INTEGER(byteLength);
-    }
+  if (IS_UNDEFINED(new.target)) {
+    throw MakeTypeError(kConstructorNotFunction, "DataView");
+  }
 
-    var bufferByteLength = %_ArrayBufferGetByteLength(buffer);
+  // TODO(binji): support SharedArrayBuffers?
+  if (!IS_ARRAYBUFFER(buffer)) throw MakeTypeError(kDataViewNotArrayBuffer);
+  if (!IS_UNDEFINED(byteOffset)) {
+    byteOffset = ToPositiveInteger(byteOffset, kInvalidDataViewOffset);
+  }
+  if (!IS_UNDEFINED(byteLength)) {
+    byteLength = TO_INTEGER(byteLength);
+  }
 
-    var offset = IS_UNDEFINED(byteOffset) ?  0 : byteOffset;
-    if (offset > bufferByteLength) throw MakeRangeError(kInvalidDataViewOffset);
+  var bufferByteLength = %_ArrayBufferGetByteLength(buffer);
 
-    var length = IS_UNDEFINED(byteLength)
-        ? bufferByteLength - offset
-        : byteLength;
-    if (length < 0 || offset + length > bufferByteLength) {
-      throw new MakeRangeError(kInvalidDataViewLength);
-    }
-    %_DataViewInitialize(this, buffer, offset, length);
-  } else {
-    throw MakeTypeError(kConstructorNotFunction, "DataView");
+  var offset = IS_UNDEFINED(byteOffset) ?  0 : byteOffset;
+  if (offset > bufferByteLength) throw MakeRangeError(kInvalidDataViewOffset);
+
+  var length = IS_UNDEFINED(byteLength)
+      ? bufferByteLength - offset
+      : byteLength;
+  if (length < 0 || offset + length > bufferByteLength) {
+    throw new MakeRangeError(kInvalidDataViewLength);
   }
+  var result = %NewObject(GlobalDataView, new.target);
+  %_DataViewInitialize(result, buffer, offset, length);
+  return result;
 }
 
 function DataViewGetBufferJS() {