[llvm] [EarlyCSE,TTI] Clean up temporary insts created by getOrCreateResult. (PR #134534)

[Nikita Popov via llvm-commits]

https://github.com/nikic commented:

It would be preferable to not create the instructions in the first place if the transform cannot take place. Is that feasible?

https://github.com/llvm/llvm-project/pull/134534