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These annotation may help with performance, but beyond that, they help
readers identify the common path, which is valuable given that there are
many branches in the allocator, but mostly one common path.

Bug: 998048
Change-Id: I449aa90f5256ca14069f36ef61d7a78d48f0d9fc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2616324Reviewed-by: Bartek Nowierski <bartekn@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Benoit L <lizeb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842042}