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

[Nico Weber via llvm-commits]

nico 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.

If you can fix this quickly, cool, but at least over here just `git revert 07a31adf287ca4d338232c6d79fe108a191007b4` reverts cleanly, and `llvm/utils/update_llc_test_checks.py  llvm/test/CodeGen/X86/bitcnt-big-integer.ll --llc-binary out/gn/bin/llc` is the only fixup I need to do on top of that to get `check-llvm` to pass. Am I missing to run some tests?

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