[llvm] [SLP] NFC. Use InstructionsState::valid if users just want to know whether VL has same opcode. (PR #120217)

[Han-Kuan Chen via llvm-commits]

HanKuanChen wrote:

> > > Looks like this has been crashing for a couple of hours.
> > > Can we revert this to unblock people or land a fix ASAP?
> > 
> > 
> > It is fixed by #122443.
> 
> I see, but the fix hasn't landed yet, and it is not clear when it will land. If it takes longer, the change should be reverted
> 
> Also, if the change fixes a crash, I don't think it is really NFC :)

Really appreciate your advice. I will test more and resubmit it. It is reverted already.

https://github.com/llvm/llvm-project/pull/120217