[FIX] typos

Author: MeowMJ

src/DFGNode.cpp

@@ -335,14 +335,6 @@ void DFGNode::setCombine(string type) {
   m_combinedtype = type;
 }
 
-bool DFGNode::hasMerged() {
-  return m_merged;
-}
-
-void DFGNode::setMerge() {
-  m_merged = true;
-}
-
 void DFGNode::addPatternPartner(DFGNode* t_patternNode) {
   // setCombine() and setMerge() use the same addPatternPartner
   m_isPatternRoot = true;