[llvm] [SimplifyQuery] Include a context-function (NFC) (PR #225369)

[Nikita Popov via llvm-commits]

nikic wrote:

This seems to be a very different result to the previous experiment. What's the difference?

I guess that something that might make this expensive is that you are eagerly initializing CtxF from CtxI. We should also have a getter that takes it either from the provided CtxF or from CtxI only when needed.

https://github.com/llvm/llvm-project/pull/225369