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

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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