[es6] stage harmony_rest_parameters
[es6] stage harmony_rest_parameters

BUG=v8:2159
R=arv@chromium.org
LOG=N

Review URL: https://codereview.chromium.org/1099813005

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#27978}

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh