[llvm] [SLP]Support LShr as base for copyable elements (PR #153393)

[Arthur Eubanks via llvm-commits]

aeubanks wrote:

> Checked the most recent version, cannot reproduce it

this seems to have been fixed with 758c6852c3ffe6b5e259cafadd811e60d8c276fb

https://github.com/llvm/llvm-project/pull/153393