Adds a hook for low-level NestedSet access.

PiperOrigin-RevId: 214446839

src/main/java/com/google/devtools/build/lib/collect/nestedset/NestedSet.java

diff --git a/src/main/java/com/google/devtools/build/lib/collect/nestedset/NestedSet.java b/src/main/java/com/google/devtools/build/lib/collect/nestedset/NestedSet.java
index 5371c30..8402166 100644
--- a/src/main/java/com/google/devtools/build/lib/collect/nestedset/NestedSet.java
+++ b/src/main/java/com/google/devtools/build/lib/collect/nestedset/NestedSet.java
@@ -198,6 +198,16 @@
     }
   }
 
+  /**
+   * Public version of {@link #getChildren}.
+   *
+   * <p>Strongly prefer {@link NestedSetVisitor}. Internal representation subject to change without
+   * notice.
+   */
+  public Object getChildrenUnsafe() {
+    return getChildren();
+  }
+
   /** Returns the internal item, array, or future. */
   Object rawChildren() {
     return children;