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It performs consistently worse in all situations.

Make CHECKED_PTR2_AVOID_BRANCH_WHEN_DEREFERENCING
the default variant while at it, because it performs slightly better
than the default one.

Bug: 1073933
Change-Id: Iacd53766ea83b2e3d0e074e5a85034f51ed1bf9c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2463089
Auto-Submit: Bartek Nowierski <bartekn@chromium.org>
Reviewed-by: Benoit L <lizeb@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817268}