Revert of Continue learning for calls in optimized code when we have no type feedback. (patchset #4 id:60001 of https://codereview.chromium.org/868453005/)

Reason for revert:
Serializer tests broke. Need to debug and fix.

Original issue's description:
> Continue learning for calls in optimized code when we have no type feedback.
>
> Based on CL https://codereview.chromium.org/871063002/ which needs to land first.
>
> BUG=
>
> Committed: https://crrev.com/f5f2692b5ff70ac3cd06a903b7846174b97a2e55
> Cr-Commit-Position: refs/heads/master@{#26292}

TBR=verwaest@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Review URL: https://codereview.chromium.org/878103002

Cr-Commit-Position: refs/heads/master@{#26293}