[RISCV][NFC] clang-format a comment into 80 columns

Author: pfusik

llvm/lib/Target/RISCV/RISCVISelLowering.cpp

@@ -16542,10 +16542,11 @@ static SDValue expandMul(SDNode *N, SelectionDAG &DAG,
   if (Subtarget.hasVendorXqciac() && isInt<12>(CNode->getSExtValue()))
     return SDValue();
 
-  // WARNING: The code below is knowingly incorrect with regards to undef semantics.
-  // We're adding additional uses of X here, and in principle, we should be freezing
-  // X before doing so.  However, adding freeze here causes real regressions, and no
-  // other target properly freezes X in these cases either.
+  // WARNING: The code below is knowingly incorrect with regards to undef
+  // semantics.  We're adding additional uses of X here, and in principle, we
+  // should be freezing X before doing so.  However, adding freeze here causes
+  // real regressions, and no other target properly freezes X in these cases
+  // either.
   if (Subtarget.hasShlAdd(3)) {
     SDValue X = N->getOperand(0);
     int Shift;