[llvm] [CodeGen] Improve ExpandMemCmp for more efficient non-register aligned sizes handling (PR #69942)

[David Spickett via llvm-commits]

DavidSpickett wrote:

https://lab.llvm.org/buildbot/#/builders/185/builds/5239 is the plain AArch64 build, still in stage 1 at the moment.

https://github.com/llvm/llvm-project/pull/69942