This removes some unnecessary runtime calls when encoding/decoding
values stored in exception objects. It reduces code size of the
generated code.

R=clemensh@chromium.org
BUG=v8:8341

Change-Id: I2394994be01d3071e58bfa2bfbba8bf72a6a04a5
Reviewed-on: https://chromium-review.googlesource.com/c/1293373
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56860}