[compiler-rt] [llvm] [MC/DC][Coverage] Introduce "Bitmap Bias" for continuous mode (PR #96126)

[Jessica Paquette via llvm-commits]

https://github.com/ornata approved this pull request.

This only impacts MC/DC with continuous mode enabled, so I think it's fine to merge this.

I think that we should try to make this more performant though.

https://github.com/llvm/llvm-project/pull/96126