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Creates a fast runtime path for checked and clamped absolute value.

Change-Id: Ibabc3cd8d4eda0a44703d3197d03bba7c746ba11
Reviewed-on: https://chromium-review.googlesource.com/573529Reviewed-by: Erik Chen <erikchen@chromium.org>
Commit-Queue: Justin Schuh <jschuh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487318}