PPC: [es6] generate rest parameters correctly for subclass constructors
PPC: [es6] generate rest parameters correctly for subclass constructors

commit bef80fcfd7e89cadc215f7d10a016a375e346490

Original commit message:
BUG=v8:3977
R=dslomov@chromium.org, arv@chromium.org
LOG=N

R=mbrandy@us.ibm.com, svenpanne@chromium.org, danno@chromium.org, jkummerow@chromium.org

Review URL: https://codereview.chromium.org/1018043008

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#27390}

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