This adds back another register to the record write stub to have one
additional register on top of the parameter register as allocation
general purpose register. It has only been recently reduced to just four
registers due to embedded builtins. This is needed to be able to tail
call a record write stub.

R=ulan@chromium.org
CC=jgruber@chromium.org
BUG=v8:8341

Change-Id: Id16f9e96d611a871fbe1180581eaf14275a7332e
Reviewed-on: https://chromium-review.googlesource.com/c/1297955Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56955}