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In this variant, the unwrapper does the least possible amount of work,
by simply clearing the generation bit. This is good for perf testing of
only the wrapper side.

Furthermore, it allows perf testing of partial wrapper implementations
that don't leave the wrapped pointer in a good state, but it doesn't
matter, because the unwrapper ignores that state.

Bug: 1073933
Change-Id: Ied6f7683888e321fb2992eb3124beb899f53e843
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2306489
Commit-Queue: Bartek Nowierski <bartekn@chromium.org>
Auto-Submit: Bartek Nowierski <bartekn@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789793}