Update tests to use APIs defined by included files

The `$DETACHBUFFER` function is the preferred mechanism for detaching
array buffers.

Likewise, `verifyNotWritable` is the preferred mechanism for asserting
lack of writability.

test/built-ins/ArrayIteratorPrototype/next/detach-typedarray-in-progress.js

@@ -18,7 +18,7 @@ testWithTypedArrayConstructors(TA => {
   var i = 0;
   assert.throws(TypeError, () => {
     for (let key of typedArray.keys()) {
-      $262.detachArrayBuffer(typedArray.buffer);
+      $DETACHBUFFER(typedArray.buffer);
       i++;
     }
   });

test/built-ins/Object/defineProperties/15.2.3.7-6-a-28.js

@@ -18,9 +18,7 @@ Object.defineProperties(obj, {
   }
 });
 
-if (isWritable(obj, "prop")) {
-  $ERROR('Expected obj["prop"] not to be writable.');
-}
+verifyNotWritable(obj, "prop");
 
 if (!obj.hasOwnProperty("prop")) {
   $ERROR('Expected obj.hasOwnProperty("prop") to be true, actually ' + obj.hasOwnProperty("prop"));

test/built-ins/TypedArrayConstructors/internals/DefineOwnProperty/BigInt/tonumber-value-detached-buffer.js

@@ -36,7 +36,7 @@ testWithBigIntTypedArrayConstructors(function(TA) {
     {
       value: {
         valueOf: function() {
-          $262.detachArrayBuffer(ta.buffer);
+          $DETACHBUFFER(ta.buffer);
           return 42n;
         }
       }

test/built-ins/TypedArrayConstructors/internals/DefineOwnProperty/tonumber-value-detached-buffer.js

@@ -36,7 +36,7 @@ testWithTypedArrayConstructors(function(TA) {
     {
       value: {
         valueOf: function() {
-          $262.detachArrayBuffer(ta.buffer);
+          $DETACHBUFFER(ta.buffer);
           return 42;
         }
       }

test/built-ins/TypedArrayConstructors/internals/Set/BigInt/tonumber-value-detached-buffer.js

@@ -32,7 +32,7 @@ testWithBigIntTypedArrayConstructors(function(TA) {
   assert.throws(TypeError, function() {
     Reflect.set(ta, 0, {
       valueOf: function() {
-        $262.detachArrayBuffer(ta.buffer);
+        $DETACHBUFFER(ta.buffer);
         return 42n;
       }
     });

test/built-ins/TypedArrayConstructors/internals/Set/tonumber-value-detached-buffer.js

@@ -32,7 +32,7 @@ testWithTypedArrayConstructors(function(TA) {
   assert.throws(TypeError, function() {
     Reflect.set(ta, 0, {
       valueOf: function() {
-        $262.detachArrayBuffer(ta.buffer);
+        $DETACHBUFFER(ta.buffer);
         return 42;
       }
     });