There's no reason to limit the CompareIC to (known) JSObject instances,
as all JSReceivers behave the same wrt. abstract and strict equality.
So remove this historical limitation and track JSReceivers instead.

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/1502963002

Cr-Commit-Position: refs/heads/master@{#32642}