Saving/restoring only registers in the restricted set before calling
RecordWrite code stub, which prepares for turning on
`v8_enable_csa_write_barrier` on all architectures.

Bug: chromium:749486
Change-Id: I6c8ba0c1561513569218e80011673cf24c7d6127
Reviewed-on: https://chromium-review.googlesource.com/641531Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Albert Mingkun Yang <albertnetymk@google.com>
Cr-Commit-Position: refs/heads/master@{#47770}