Before this patch, those builtin objects all used a strange-looking
pattern for creation that involved creating a new constructor
function (likely in order to get their ES5 [[Class]] set
appropriately).

But in modern times, with @@toStringTag as the mechanism of returning
the correct toString value, there should be no need for those extra
hoops, so simply use the Object constructor instead.

Change-Id: Id841dace26bf71f73ec25a71f1297d502438b27c
Reviewed-on: https://chromium-review.googlesource.com/533922
Commit-Queue: Adam Klein <adamk@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45963}