[llvm] Revert "[InlineSpiller] Check rematerialization before folding operand (#134015)" (PR #137801)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> Can I pass RegClassInfo into InlineSpiller, and call RegClassInfo.getOrder() to get the similar information?

I'm not sure that's much better, it's still the inliner trying to perform an assignment 

https://github.com/llvm/llvm-project/pull/137801