Replace bitwise arithmetic with conditional move / select instructions
on ia32, x64, Arm and Arm64. In local tests this improves --noopt Ignition
performance by between 2-5%.

BUG=chromium:798964

Change-Id: I82832e5d28469a574a575119c1a665b5c2c93bb2
Reviewed-on: https://chromium-review.googlesource.com/916561
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Michael Stanton <mvstanton@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51444}