Only use one set of %StrictEquals/%StrictNotEquals and
%Equals/%NotEquals runtime entries for both the interpreter
and the old-style CompareICStub. The long-term plan is to
update the CompareICStub to also return boolean values, and
even allow some more code sharing with the interpreter there.

R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/1738883002

Cr-Commit-Position: refs/heads/master@{#34303}