compiler_rt: restructure compiler_rt.zig according to README.md
Justifications
- compiler_rt base routines are almost finished, so make 1:1
mapping of code and documentation.
- Make adjustments to code + documentation simpler to prevent technical or
documentation debt.
476bdc8b0bJan Philipp Hafer committed on 2/19/2023, 7:00:55 PM· committed by Andrew Kelleyparentadfc019