Remove dead code and fix whitespace issue

ConflictSet.cpp

@@ -332,8 +332,7 @@ uint8_t *Node::partialKey() {
   case Type::Node256:
     return ((Node256 *)this)->partialKey();
   }
-  __builtin_unreachable();
-  ; // GCOVR_EXCL_LINE
+  __builtin_unreachable(); // GCOVR_EXCL_LINE
 }
 
 struct NodeAllocators {
@@ -526,12 +525,6 @@ int getChildGeq(Node *self, int child) {
   return -1;
 }
 
-void setChildrenParents(Node4 *n) {
-  for (int i = 0; i < n->numChildren; ++i) {
-    n->children[i].child->parent = n;
-  }
-}
-
 void setChildrenParents(Node16 *n) {
   for (int i = 0; i < n->numChildren; ++i) {
     n->children[i].child->parent = n;