This replaces LOOKUP_SLOT_CALL with WITH_CALL, and relies on regular lookup-slot handling in variable load to support other lookup slots (variables resolved in the context of sloppy eval). This allows optimizations for such variable loads to kick in for calls as well. We only need special handling for function calls in the context of with, since it changes the receiver of the call from undefined/global to the with-object.

This currently doesn't yet make it work for the direct eval call itself, since the POSSIBLY_EVAL_CALL flag is also used to deal with direct eval later.

BUG=

Review-Url: https://codereview.chromium.org/2480253006
Cr-Commit-Position: refs/heads/master@{#40962}