[llvm-dev] reg coalescing improvements

[Jonas Paulsson via llvm-dev]

Hi Quentin,
> I may be optimistic but I would hope that reordering the instructions in mischeduler after the coalescer would allow regalloc to do the right thing, because the hints derived from the copy will be able to be satisfied.
>
> Is that not the case?
Yes, of course, enabling mischeduler helps things so that regalloc can 
coalesce it even when the coalescer couldn't... thanks /Jonas