We cannot skip the @@hasInstance lookup in instanceof depending on a
global protector cell, as the lookup of the property is observable
via proxies or accessors. So remove the global protector and properly
implement CSA::InstanceOf via GetPropertyStub, with an appropriate
fast-path for Function.prototype[@@hasInstance] where we call the
builtin code object directly if the function matches, skipping all
the checks from the call sequence, and also avoid the redundant
ToBoolean conversion on the result.

R=yangguo@chromium.org
TBR=ulan@chromium.org
BUG=v8:5958

Review-Url: https://codereview.chromium.org/2684033012
Cr-Commit-Position: refs/heads/master@{#43137}