This makes all runtime calls compiled by Liftoff load the respective
CEntry builtin from the instance object instead of embedding it into the
instruction stream. Another step towards making the code independent of
the originating Isolate.

As a drive-by this also changes one implicit runtime call in the stack
check in the TurboFan backend in a similar fashion.

R=clemensh@chromium.org
BUG=v8:7424

Change-Id: Ifab5995aa95250d6fae60ef5debb98aee2b6fc0c
Reviewed-on: https://chromium-review.googlesource.com/1089067
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53578}