[clang] [llvm] Cleanup MC/DC intrinsics for #82448 (PR #95496)

[via llvm-commits]

zmodem wrote:

> Re. condbitmap.update, it has become useless after #82448 . I think pruning it will be the possible way.

Can you expand on this? I'm not familiar with these intrinsics at all. What are users who were using `condbitmap.update` supposed to call now?

https://github.com/llvm/llvm-project/pull/95496