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

[Ahmed Bougacha via llvm-commits]

ahmedbougacha wrote:

FYI I fixed some build breakage in 1f56afa9b4d1 while you all discuss the revert here;  you'll probably want to revert that as well.

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