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

[Jessica Paquette via llvm-commits]

ornata wrote:

Do we have an expected % performance impact?

If perf is critical, could it be possible to only handle ELF for now, and support COFF + Mach-O later?  My intuition says that most folks that care about MC/DC are going to primarily be working with ELF.

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