[llvm] [GlobalISel] Don't treat intrinsic callbr indirect dest as machine successor. (PR #221685)

[Christudasan Devadasan via llvm-commits]

cdevadas wrote:

> I don't understand what this is supposed to solve, but we don't really want the selector pass to be hacking up the CFG

Yes. The proposed fix does not directly address the issue described in the PR; instead, it focuses on how unreachable blocks are processed. @vg0204 better close this.

https://github.com/llvm/llvm-project/pull/221685