Fix spelling typo. NFC

commutatvity -> commutativity

Author: RKSimon

llvm/lib/Target/X86/X86ISelLowering.cpp

@@ -52193,7 +52193,7 @@ static SDValue combineAndnp(SDNode *N, SelectionDAG &DAG,
   if (SDValue Not = IsNOT(N0, DAG))
     return DAG.getNode(ISD::AND, DL, VT, DAG.getBitcast(VT, Not), N1);
 
-  // Fold for better commutatvity:
+  // Fold for better commutativity:
   // ANDNP(x,NOT(y)) -> AND(NOT(x),NOT(y)) -> NOT(OR(X,Y)).
   if (N1->hasOneUse())
     if (SDValue Not = IsNOT(N1, DAG))