[llvm] [HEXAGON] [MachinePipeliner] Fix the DAG in case of dependent phis. (PR #135925)

[Nuno Lopes via llvm-commits]

nunoplopes wrote:

> @tru @nunoplopes Any pointers on how to resolve this code_formatter error? I see that this issue is irrelevant to my patch.

I'm on it. The last patch broke the check, sorry.

https://github.com/llvm/llvm-project/pull/135925