These will be used by ic-collecting builtins called from both bytecode
handlers and js-generic-lowering.

For now only x64 is implemented.

Bug: v8:8888
Change-Id: I12a21b40061b7cb6c9b3cbad6134e7457a6cfa44
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2184237
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67611}