Reland of [fullcodegen] Refactor code that calls store ICs. (patchset #1 id:1 of https://codereview.chromium.org/2363123002/ )

Reason for revert:
Didn't help

Original issue's description:
> Revert of [fullcodegen] Refactor code that calls store ICs. (patchset #1 id:20001 of https://codereview.chromium.org/2363513003/ )
>
> Reason for revert:
> race suspect:
> https://build.chromium.org/p/client.v8/builders/V8%20Linux64%20TSAN/builds/11893
>
> Original issue's description:
> > [fullcodegen] Refactor code that calls store ICs.
> >
> > Make FCG::CallStoreIC() load slot and name and make FCG::CallKeyedStoreIC() load
> > slot according to store IC calling convention (StoreDescriptor).
> >
> > BUG=v8:5407
> >
> > Committed: https://crrev.com/12918397b4af7b2bede8b29e1e9b1940d5d5ad3b
> > Cr-Commit-Position: refs/heads/master@{#39679}
>
> TBR=mvstanton@chromium.org,ishell@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=v8:5407
>
> Committed: https://crrev.com/51fa56d1b8e9e320f7442682415e9df50ab19591
> Cr-Commit-Position: refs/heads/master@{#39682}

TBR=mvstanton@chromium.org,ishell@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5407

Review-Url: https://codereview.chromium.org/2361393005
Cr-Commit-Position: refs/heads/master@{#39683}