Building clang in buildworld as part of the bootstrap process -- is it really necessary?

[Garrett Cooper]

> tl;dr: NO.

Makes sense. I'll do some poking around and see if things could potentially be optimized with the clang build. On beefy machines it's not a big deal, but as we know on machines without a ton of memory or SSDs, it can become painful, as expected.

Thanks :)!
-Garrett