[llvm] [MCP] Move dependencies if they block copy propagation (PR #105562)

[Quentin Colombet via llvm-commits]

https://github.com/qcolombet commented:

Only had a cursory look.
The direction seems (we compute a DDG and do some stuff with it) but I didn't look closely at the logic.
I remain skeptical that the compile time impact is negligible.
Could you use CTMark from the LLVM test suite to valid your initial measurements?

https://github.com/llvm/llvm-project/pull/105562