Even though both are allowed in the style guide, it recommends to use
'using', as its syntax is more consistent with the rest of C++.
This CL turns all typedefs in compiler code to 'using' declarations.

R=mstarzinger@chromium.org

Bug: v8:8834
Change-Id: I3baf3ecbfe2c853cb17bb479ebbf140382193b5c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1545896
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60527}