[mips] Modify comment to test new email address (NFC).

llvm-svn: 335269

llvm/lib/Target/Mips/MipsISelLowering.cpp

@@ -740,7 +740,7 @@ static SDValue performSELECTCombine(SDNode *N, SelectionDAG &DAG,
     return DAG.getNode(ISD::ADD, DL, SetCC.getValueType(), SetCC, True);
   }
 
-  // Couldn't optimize.
+  // Could not optimize.
   return SDValue();
 }