Whenever the InstanceOfStub finds a proxy (either passed as object or
somewhere on the prototype chain), it should bailout to the
%HasInPrototypeChain runtime function, which will do the right thing
(soonish).

R=yangguo@chromium.org
BUG=v8:1543
LOG=n

Review URL: https://codereview.chromium.org/1492243003

Cr-Commit-Position: refs/heads/master@{#32549}