[llvm] [DAGCombiner][X86] Improve chain handling in fold (fshl ld1, ld0, c) -> (ld0[ofs]) combine. (PR #124871)

[Simon Pilgrim via llvm-commits]

https://github.com/RKSimon approved this pull request.

LGTM - cheers. (I think DAGCombiner::CombineConsecutiveLoads has a similar issue?)

https://github.com/llvm/llvm-project/pull/124871