We can constant fold %_IsJSReceiver(x) based on whether x is always a
receiver or can never be a receiver.  This is important as
%_IsJSReceiver is inserted by the JSInliner.

R=jarin@chromium.org
BUG=v8:4544
LOG=n

Review URL: https://codereview.chromium.org/1486383003

Cr-Commit-Position: refs/heads/master@{#32519}