[llvm] [SLP] Match poison as instruction with the same opcode (PR #115946)

[Alexey Bataev via llvm-commits]

alexey-bataev wrote:

> @alexey-bataev ah sorry - the initial dumps I pasted weren't at the right point in the pass pipeline; those different stores actually appear at the end of `InstCombinePass`.

What is the target triple, nvptx64-unknown-unknown?

https://github.com/llvm/llvm-project/pull/115946