Variadic template FTW!

R=mstarzinger@chromium.org
BUG=v8:6474

Change-Id: I0585e25e861e8a2fcd29501872edd6b0dd494302
Reviewed-on: https://chromium-review.googlesource.com/529188Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45836}