[llvm] MTM: improve operand latency when missing sched info (PR #101389)

[Ramkumar Ramachandra via llvm-commits]

artagnon wrote:

Rebase (yet again), with a change: use `DefMI->getIterator()`, `UseMI->getIterator()` instead of iterating over MBB.

https://github.com/llvm/llvm-project/pull/101389