Since we require C++11 support now, there is no need to use
__attribute__ or __declspec, all compilers should support the
[[noreturn]] attribute.

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

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_rel_ng
Change-Id: I6c478c69658fd23c1c8ca468fbf3c6a36474ef66
Reviewed-on: https://chromium-review.googlesource.com/529072Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45909}