[llvm] [SLP] NFC. Replace TreeEntry::setOperandsInOrder with VLOperands. (PR #113880)

[Luke Lau via llvm-commits]

lukel97 wrote:

No, it's with an LTO build so there's no single .ll or .c file I can pick out to reduce yet. Do you have access to SPEC CPU 2017?

https://github.com/llvm/llvm-project/pull/113880