[SLP][NFC]Add parens to silence a warning message, NFC

Author: alexey-bataev

llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp

@@ -5399,16 +5399,16 @@ class slpvectorizer::BoUpSLP {
           // considered as non-commutative, operands reordering does not change
           // the semantics.
           assert(
-              !IsCommutativeUser ||
-              (((::isCommutative(User) &&
-                 ::isCommutableOperand(User, User, 0) &&
-                 ::isCommutableOperand(User, User, 1)) ||
-                (::isCommutative(TE->getMatchingMainOpOrAltOp(User), User) &&
-                 ::isCommutableOperand(TE->getMatchingMainOpOrAltOp(User), User,
-                                       0) &&
-                 ::isCommutableOperand(TE->getMatchingMainOpOrAltOp(User), User,
-                                       1)))) &&
-                  "Expected commutative user with 2 first commutable operands");
+              (!IsCommutativeUser ||
+               (((::isCommutative(User) &&
+                  ::isCommutableOperand(User, User, 0) &&
+                  ::isCommutableOperand(User, User, 1)) ||
+                 (::isCommutative(TE->getMatchingMainOpOrAltOp(User), User) &&
+                  ::isCommutableOperand(TE->getMatchingMainOpOrAltOp(User),
+                                        User, 0) &&
+                  ::isCommutableOperand(TE->getMatchingMainOpOrAltOp(User),
+                                        User, 1))))) &&
+              "Expected commutative user with 2 first commutable operands");
           bool IsCommutativeWithSameOps =
               IsCommutativeUser && User->getOperand(0) == User->getOperand(1);
           if ((!IsCommutativeUser || IsCommutativeWithSameOps) &&