[llvm] [SLP] NFC. Remove the useless check for alternate instruction. (PR #117116)

[Alexey Bataev via llvm-commits]

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@@ -1003,7 +1003,7 @@ static InstructionsState getSameOpcode(ArrayRef<Value *> VL,
             AltPred == CurrentPred || AltPred == SwappedCurrentPred)
           continue;
       }
-    } else if (InstOpcode == Opcode || InstOpcode == AltOpcode) {
+    } else if (InstOpcode == Opcode) {
       if (auto *Gep = dyn_cast<GetElementPtrInst>(I)) {
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alexey-bataev wrote:

Add the assertion instead of the check

https://github.com/llvm/llvm-project/pull/117116