[llvm] [SLP]Initial support for copyable elements (non-schedulable only) (PR #140279)

[Simon Pilgrim via llvm-commits]

https://github.com/RKSimon commented:

llvm\test\Transforms\SLPVectorizer\X86\vect_copyable_in_binops.ll has a number of add tests - how come none of them matched?

https://github.com/llvm/llvm-project/pull/140279