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We suspect that CheckedPtr2 and MTECheckedPtr suffer from cache misses.
This solution will help us verify this hypothesis by satisfying all
requests from a single tag, which is very likely in a hot cacheline.

Bug: 1073933,1092288
Change-Id: I5ca13baed9e183d509d7546dffc5fa921cac252d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2306131
Commit-Queue: Bartek Nowierski <bartekn@chromium.org>
Auto-Submit: Bartek Nowierski <bartekn@chromium.org>
Reviewed-by: Takashi Sakamoto <tasak@google.com>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789866}