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Restore the callee-save registers now provided in the V8 API when
unwinding. This is a necessary condition to support unwinds of
functions that use dynamic stack allocation, which is failure mode
1 in the corresponding bug.

Bug: 1122124
Change-Id: Ifb30bbdd9df343251a7c215e5a5fc140754ac216
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2500453Reviewed-by: Etienne Pierre-Doray <etiennep@chromium.org>
Commit-Queue: Mike Wittman <wittman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822204}