Remove an old outdated comment that makes no sense.

This comment was left over from a long time ago. It is no longer true.

Source/Core/Core/CoreParameter.cpp

@@ -98,7 +98,7 @@ void SCoreStartupParameter::LoadDefaults()
 	bJITOff = false; // debugger only settings
 	bJITLoadStoreOff = false;
 	bJITLoadStoreFloatingOff = false;
-	bJITLoadStorePairedOff = false; // XXX not 64-bit clean
+	bJITLoadStorePairedOff = false;
 	bJITFloatingPointOff = false;
 	bJITIntegerOff = false;
 	bJITPairedOff = false;