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

[David Green via cfe-commits]

davemgreen wrote:

It sounds OK so lang as we can make sure the backend patterns keep working - it sounds like it would be more resilient overall if we matched both forms. I think it was just assumed in the past that is wasn't needed.

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