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PartitionRoot precomputes constants that are needed in the hot path, to
save branches. These constants are the same across all PartitionRoots,
and they could be known at compile-time.

This CL precomputes these at compile time, which saves ~1kiB per
PartitionRoot, and should improve cache locality, as we have multiple
partitions in use at any point.

Bug: 998048
Change-Id: I36ff92b8df684c7788a1ffee7cfb160d3e4cc98b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2375248
Commit-Queue: Benoit L <lizeb@chromium.org>
Reviewed-by: Bartek Nowierski <bartekn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804886}