Comment # 84 on bug 1212101 from Lee Salzman

I landed a slightly different idea in Firefox that should hypothetically still
work: https://phabricator.services.mozilla.com/D182855

I am just making sure I rename the skvx namespace every time we build with
different arch options, so that it doesn't end up with a bunch of different
ambiguous symbols in the skvx namespace. This is easier than doing anything in
the source files themselves which would require vendored patches or upstream
Skia changes.

It might take a day or so to actually get in nightly, but it's on autoland at
the moment. You can also try applying the patch to your local builds, and see
if it allows building with LTO again on GCC?