Reland of [gn] Switch gcc bots to gn (patchset #1 id:1 of https://codereview.chromium.org/2130303002/ )

Reason for revert:
Relanding as the goma problem is due to an upgrade of the binutils version we use.

Original issue's description:
> Revert of [gn] Switch gcc bots to gn (patchset #3 id:40001 of https://codereview.chromium.org/2124263002/ )
>
> Reason for revert:
> There are a bunch of goma errors on the gcc bot now. Maybe connected to this CL.
>
> https://build.chromium.org/p/tryserver.v8/builders/v8_linux_gcc_compile_rel/builds/19068
>
> Original issue's description:
> > [gn] Switch gcc bots to gn
> >
> > BUG=chromium:474921
> >
> > Committed: https://crrev.com/73f154ba601dc70c4007968fa902d4beacba4393
> > Cr-Commit-Position: refs/heads/master@{#37580}
>
> TBR=vogelheim@chromium.org,jochen@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=chromium:474921
>
> Committed: https://crrev.com/980d0d6e227f8de3cc0b71a0d3f492908adcf138
> Cr-Commit-Position: refs/heads/master@{#37603}

TBR=vogelheim@chromium.org,jochen@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=chromium:474921
NOTRY=true

Review-Url: https://codereview.chromium.org/2132333002
Cr-Commit-Position: refs/heads/master@{#37624}