[llvm] [X86] Fix duplicated compute in recursive search. (PR #130226)

[Simon Pilgrim via llvm-commits]

https://github.com/RKSimon commented:

Would we be better off just adding a recursive depth limit (SelectionDAG::MaxRecursionDepth) like we do in other recursive calls?

https://github.com/llvm/llvm-project/pull/130226