typed-arrays/bigint: fixes per recommendation. (#1473)

Fixes gh-1467

test/built-ins/BigInt/prototype/Symbol.toStringTag.js

@@ -20,18 +20,3 @@ verifyProperty(BigInt.prototype, Symbol.toStringTag, {
   enumerable: false,
   configurable: true
 });
-
-assert.sameValue(Object.prototype.toString.call(3n), "[object BigInt]");
-assert.sameValue(Object.prototype.toString.call(Object(3n)), "[object BigInt]");
-
-// Verify that Object.prototype.toString does not have special casing for BigInt
-// as it does for most other primitive types
-Object.defineProperty(BigInt.prototype, Symbol.toStringTag, {
-  value: "FooBar",
-  writable: false,
-  enumerable: false,
-  configurable: true
-});
-
-assert.sameValue(Object.prototype.toString.call(3n), "[object FooBar]");
-assert.sameValue(Object.prototype.toString.call(Object(3n)), "[object FooBar]");

test/built-ins/TypedArrays/ctors-bigint/typedarray-arg/custom-proto-access-throws.js

@@ -38,7 +38,7 @@ Object.defineProperty(newTarget, "prototype", {
   }
 });
 
-var sample = new Int8Array();
+var sample = new BigInt64Array();
 
 testWithBigIntTypedArrayConstructors(function(TA) {
   assert.throws(Test262Error, function() {

test/built-ins/TypedArrays/ctors-bigint/typedarray-arg/detached-when-species-retrieved-different-type.js

@@ -52,7 +52,7 @@ testWithBigIntTypedArrayConstructors(function(TA) {
     ta.buffer.constructor = bufferConstructor;
 
     assert.throws(TypeError, function() {
-        var targetType = TA !== Int32Array ? Int32Array : Uint32Array;
+        var targetType = TA !== BigInt64Array ? BigInt64Array : BigUint64Array;
         new targetType(ta);
     }, "TypeError thrown for detached source buffer");
 

test/built-ins/TypedArrays/ctors-bigint/typedarray-arg/other-ctor-returns-new-typedarray.js

@@ -2,20 +2,20 @@
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-typedarray-typedarray
-description: >
+description: Instantiate a new TypedArray with an existing TypedArray
-  Return abrupt from getting typedArray argument's buffer.constructor.@@species
 info: |
   22.2.4.3 TypedArray ( typedArray )
 
   This description applies only if the TypedArray function is called with at
   least one argument and the Type of the first argument is Object and that
   object has a [[TypedArrayName]] internal slot.
+
 includes: [testBigIntTypedArray.js]
 features: [BigInt, TypedArray]
 ---*/
 
-var sample1 = new BigInt64Array();
+var sample1 = new BigInt64Array(7);
-var sample2 = new BigUint64Array();
+var sample2 = new BigUint64Array(7);
 
 testWithBigIntTypedArrayConstructors(function(TA) {
   var sample = TA === BigInt64Array ? sample2 : sample1;