The Generic access info was introduced to handle transitioning stores
that extend the properties backing store (by reusing the STORE_IC). But
since crrev.com/2778133003 TurboFan handles these by just inlining the
properties backing store (re)allocation, and thus this is now dead code.

BUG=v8:5267

Review-Url: https://codereview.chromium.org/2811593002
Cr-Commit-Position: refs/heads/master@{#44505}