Revert of Reland of 'Optimize trivial regexp disjunctions' CL 1176453002 (patchset #2 id:20001 of https://codereview.chromium.org/1174713002/)

Reason for revert:
Tree looks like a Christmas tree and this isn't helping

Original issue's description:
> Reland of 'Optimize trivial regexp disjunctions' CL 1176453002
>
> Original code review: https://codereview.chromium.org/1176453002/
>
> TBR=yangguo@chromium.org
> BUG=chromium:482998
> LOG=n
>
> Committed: https://crrev.com/85fab0fa092e8d979413f6a61baec3abe26e568d
> Cr-Commit-Position: refs/heads/master@{#28884}

TBR=yangguo@chromium.org,erikcorry@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:482998

Review URL: https://codereview.chromium.org/1172893002

Cr-Commit-Position: refs/heads/master@{#28885}