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This CL fixes a performance regression introduced by r829145.

When both partition cookies and reference counts are disabled at
compile time (which is the current default configuration),
|AdjustSizeForExtrasAdd| and similar functions become no-op.

Make the compiler aware of that.

Bug: 1150917
Change-Id: I24e91177d4575a5ea013a9c647641c6389aa01a9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2571281Reviewed-by: Benoit L <lizeb@chromium.org>
Commit-Queue: Sergei Glazunov <glazunov@google.com>
Cr-Commit-Position: refs/heads/master@{#833310}