Adapt to `quant` dialect change.

[bjacob]

https://github.com/llvm/llvm-project/pull/100667 renamed a header, so this adapts the #include.

I need to cherry-pick this commit in IREE as we are integrating these llvm-project changes. You will need to apply this change in your next LLVM integrate. Leaving as "draft" PR until then to avoid polluting your review queues.