[llvm] Branch folding: Do not use both TII::analyzeBranch and MBB::isSuccessor (PR #104240)

[via llvm-commits]

v01dXYZ wrote:

There is a big problem with my suggestion because some instructions are not marked as terminators although they allow modifying execution path: `INT` for example for `x86`.

https://github.com/llvm/llvm-project/pull/104240