There are a bunch of places in our builtins where we use %_Arguments and
%_ArgumentsLength for no good reason, as arguments object and/or rest
parameter is as good and performant in these cases. Now the only uses
of %_Arguments and %_ArgumentsLength left are in string.js, which
requires dedicated investigation.

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/1678953004

Cr-Commit-Position: refs/heads/master@{#33834}