[llvm] [SystemZ] Memoize findCCUse result to prune repetitive recursive calls for already computed SDValue Node (PR #186027)

[Ulrich Weigand via llvm-commits]

uweigand wrote:

Can you rebase against current mainline (including the depth limit), and check whether this still provides any additional compile-time benefit?

https://github.com/llvm/llvm-project/pull/186027