Reland [typedarrays] move %TypedArray%.prototype.copyWithin to C++

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index 7ab076aa2d4c5facaba8471d492be81c22a0ba56..8b1c88bf6d0b97e772f2b0285cdbd9b46d796a6f 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -2483,6 +2483,10 @@ void Genesis::InitializeGlobal(Handle<JSGlobalObject> global_object,
     values->shared()->set_builtin_function_id(kTypedArrayValues);
     JSObject::AddProperty(prototype, factory->iterator_symbol(), values,
                           DONT_ENUM);
+
+    // TODO(caitp): alphasort accessors/methods
+    SimpleInstallFunction(prototype, "copyWithin",
+                          Builtins::kTypedArrayPrototypeCopyWithin, 2, false);
   }
 
   {  // -- T y p e d A r r a y s