We had exactly one test case for --noturbo-types, so it's likely that
the generic pipeline (without types) was already broken for quite some
time, plus no one expressed interest in maintaining it, plus it
complicates the JSGenericLowering integration. So decision is to kill
it.

R=jarin@chromium.org

Review URL: https://codereview.chromium.org/1872333002

Cr-Commit-Position: refs/heads/master@{#35387}