src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.common/src/org/graalvm/compiler/core/common/cfg/Loop.java

*** 39,49 ****
  
      protected Loop(Loop<T> parent, int index, T header) {
          this.parent = parent;
          if (parent != null) {
              this.depth = parent.getDepth() + 1;
-             parent.getChildren().add(this);
          } else {
              this.depth = 1;
          }
          this.index = index;
          this.header = header;
--- 39,48 ----