precompute hash code in cell eagerly
precompute hash code in cell eagerly

Summary: I don't think we need any memoize rubbish for this.

Test Plan: CI

Reviewed By: marcinkosiba

fbshipit-source-id: c821fa3

marcinkwiatkowski/buck,shs96c/buck,clonetwin26/buck,LegNeato/buck,k21/buck,kageiit/buck,shybovycha/buck,nguyentruongtho/buck,clonetwin26/buck,robbertvanginkel/buck,robbertvanginkel/buck,facebook/buck,brettwooldridge/buck,rmaz/buck,clonetwin26/buck,brettwooldridge/buck,dsyang/buck,dsyang/buck,JoelMarcey/buck,robbertvanginkel/buck,JoelMarcey/buck,robbertvanginkel/buck,robbertvanginkel/buck,shybovycha/buck,dsyang/buck,zpao/buck,JoelMarcey/buck,clonetwin26/buck,ilya-klyuchnikov/buck,clonetwin26/buck,kageiit/buck,k21/buck,JoelMarcey/buck,shs96c/buck,Addepar/buck,rmaz/buck,clonetwin26/buck,k21/buck,brettwooldridge/buck,SeleniumHQ/buck,ilya-klyuchnikov/buck,k21/buck,shs96c/buck,shs96c/buck,brettwooldridge/buck,LegNeato/buck,dsyang/buck,dsyang/buck,ilya-klyuchnikov/buck,LegNeato/buck,SeleniumHQ/buck,shs96c/buck,shs96c/buck,nguyentruongtho/buck,LegNeato/buck,zhan-xiong/buck,LegNeato/buck,romanoid/buck,facebook/buck,Addepar/buck,zpao/buck,romanoid/buck,robbertvanginkel/buck,shybovycha/buck,LegNeato/buck,rmaz/buck,marcinkwiatkowski/buck,zhan-xiong/buck,rmaz/buck,dsyang/buck,marcinkwiatkowski/buck,robbertvanginkel/buck,brettwooldridge/buck,dsyang/buck,marcinkwiatkowski/buck,nguyentruongtho/buck,brettwooldridge/buck,clonetwin26/buck,JoelMarcey/buck,rmaz/buck,dsyang/buck,Addepar/buck,SeleniumHQ/buck,k21/buck,romanoid/buck,brettwooldridge/buck,zhan-xiong/buck,kageiit/buck,Addepar/buck,shs96c/buck,clonetwin26/buck,robbertvanginkel/buck,brettwooldridge/buck,facebook/buck,k21/buck,romanoid/buck,zpao/buck,SeleniumHQ/buck,romanoid/buck,shybovycha/buck,k21/buck,dsyang/buck,JoelMarcey/buck,JoelMarcey/buck,Addepar/buck,nguyentruongtho/buck,clonetwin26/buck,zhan-xiong/buck,marcinkwiatkowski/buck,romanoid/buck,rmaz/buck,brettwooldridge/buck,SeleniumHQ/buck,ilya-klyuchnikov/buck,ilya-klyuchnikov/buck,kageiit/buck,k21/buck,LegNeato/buck,marcinkwiatkowski/buck,k21/buck,ilya-klyuchnikov/buck,SeleniumHQ/buck,JoelMarcey/buck,LegNeato/buck,brettwooldridge/buck,JoelMarcey/buck,LegNeato/buck,SeleniumHQ/buck,SeleniumHQ/buck,ilya-klyuchnikov/buck,robbertvanginkel/buck,romanoid/buck,zpao/buck,k21/buck,romanoid/buck,marcinkwiatkowski/buck,LegNeato/buck,zpao/buck,romanoid/buck,brettwooldridge/buck,shs96c/buck,shybovycha/buck,clonetwin26/buck,robbertvanginkel/buck,brettwooldridge/buck,kageiit/buck,zhan-xiong/buck,ilya-klyuchnikov/buck,Addepar/buck,rmaz/buck,LegNeato/buck,dsyang/buck,brettwooldridge/buck,marcinkwiatkowski/buck,JoelMarcey/buck,robbertvanginkel/buck,rmaz/buck,facebook/buck,rmaz/buck,SeleniumHQ/buck,zhan-xiong/buck,zhan-xiong/buck,zhan-xiong/buck,dsyang/buck,LegNeato/buck,Addepar/buck,rmaz/buck,romanoid/buck,ilya-klyuchnikov/buck,zhan-xiong/buck,Addepar/buck,zhan-xiong/buck,shybovycha/buck,clonetwin26/buck,LegNeato/buck,shybovycha/buck,shybovycha/buck,ilya-klyuchnikov/buck,SeleniumHQ/buck,shs96c/buck,zhan-xiong/buck,rmaz/buck,marcinkwiatkowski/buck,SeleniumHQ/buck,Addepar/buck,zpao/buck,shybovycha/buck,JoelMarcey/buck,shs96c/buck,nguyentruongtho/buck,Addepar/buck,robbertvanginkel/buck,marcinkwiatkowski/buck,kageiit/buck,facebook/buck,romanoid/buck,ilya-klyuchnikov/buck,shybovycha/buck,Addepar/buck,SeleniumHQ/buck,k21/buck,dsyang/buck,robbertvanginkel/buck,JoelMarcey/buck,k21/buck,ilya-klyuchnikov/buck,SeleniumHQ/buck,rmaz/buck,zhan-xiong/buck,kageiit/buck,facebook/buck,marcinkwiatkowski/buck,Addepar/buck,romanoid/buck,romanoid/buck,marcinkwiatkowski/buck,zpao/buck,shybovycha/buck,k21/buck,shs96c/buck,dsyang/buck,clonetwin26/buck,clonetwin26/buck,shs96c/buck,zhan-xiong/buck,ilya-klyuchnikov/buck,nguyentruongtho/buck,marcinkwiatkowski/buck,shybovycha/buck,Addepar/buck,JoelMarcey/buck,shybovycha/buck,rmaz/buck,nguyentruongtho/buck,shs96c/buck,facebook/buck