This allows to inline the part where we call to the nested rule and the token
check while keeping the bulk of the work if it's actually a unary/conditional
expression outline.

Change-Id: I1b1f7ebaf2d4f660f157ece7f9534525b80a95a6
Reviewed-on: https://chromium-review.googlesource.com/1238922Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56173}