This removes special casing for the 'f.arguments' property accessor. Any
local 'arguments' variable should not be allowed to influence the value
returned by the indirect 'f.arguments' property. That property creates a
new object with a separate identity everytime it is read. This is by now
consistent with other browsers.

R=rossberg@chromium.org
TEST=mjsunit/arguments-indirect

Review URL: https://codereview.chromium.org/1408983006

Cr-Commit-Position: refs/heads/master@{#31776}