[clang] [llvm] InstCombine: Order shufflevector operands by complexity (PR #113212)

[David Green via cfe-commits]

https://github.com/davemgreen commented:

I have always expected shuffles to be canonicalized to make the lowest mask lane the first operand. I believe the AArch64 and Arm matching functions rely on that at the moment. https://godbolt.org/z/1rr1E8v1K

https://github.com/llvm/llvm-project/pull/113212