[llvm] [X86] EltsFromConsecutiveLoads - recognise reverse load patterns. (PR #168706)

[Simon Pilgrim via llvm-commits]

RKSimon wrote:

Hi @nico - thanks for the repro and I'll work on a fix first thing in the morning - an immediate full reversion will be a pain as we have a web of patches building on top of this, but if I have to I'll come up with something that doesn't cause too match damage.

https://github.com/llvm/llvm-project/pull/168706