GitLab

Moves the test code out of RangeCheck. Reorders range comparisons and
removes bitfields to avoid a GCC constexpr bug. Removes some custom
optimizations that are no longer necessary after the restructuring.

TBR=tsepez

Review-Url: https://codereview.chromium.org/2614073002
Cr-Commit-Position: refs/heads/master@{#441921}