This makes compilation mode predicates delegate to the underlying code
kind that is already stored in each {CompilationInfo}, thereby removing
potential ambiguity between these two values.

R=mvstanton@chromium.org

Change-Id: I9f4d1bb723074488cc47bdc275984b1abc960069
Reviewed-on: https://chromium-review.googlesource.com/916195Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Michael Stanton <mvstanton@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51291}