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

[Abinaya Saravanan via llvm-commits]

quic-asaravan wrote:

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

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