Add printTree

ConflictSet.cpp

@@ -1083,8 +1083,25 @@ void bench() {
   }
 }
 
+void printTree() {
+  int64_t writeVersion = 0;
+  ConflictSet::Impl cs{writeVersion};
+  ReferenceImpl refImpl{writeVersion};
+  Arena arena;
+  constexpr int kNumKeys = 5;
+  auto *write = new (arena) ConflictSet::WriteRange[kNumKeys];
+  for (int i = 0; i < kNumKeys; ++i) {
+    write[i].begin = toKey(arena, i);
+    write[i].end.len = 0;
+    write[i].writeVersion = ++writeVersion;
+  }
+  cs.addWrites(write, kNumKeys);
+  debugPrintDot(stdout, cs.root);
+}
+
 int main(void) {
-  bench();
+  // bench();
+  printTree();
   return 0;
 }
 #endif