[llvm] [RegAlloc] Scale the spill weight by the weight of register class (PR #113675)

[Ulrich Weigand via llvm-commits]

uweigand wrote:

@JonPsson1 the cond-move-regalloc-hints.mir change here looks like a regression.  Can you have a look why this happens?

https://github.com/llvm/llvm-project/pull/113675