[llvm] [RegisterCoalescer] Skip the pattern that can't resolve (PR #71024)

[Matthias Braun via llvm-commits]

MatzeB wrote:

Does that mean you encounter generic `COPY` or `SUBREG_TO_REG` instructions with an early-clobber destination (the coalescer only handles instructions with `MachineInstr::isCopyLike()` no?) ?  Is that intentional? At a first glance I would think we should just not allow early-clobber flags for these generic opcodes...

https://github.com/llvm/llvm-project/pull/71024