refactor: simplify flat equality loop control

Agent-Logs-Url: https://github.com/dadhi/FastExpressionCompiler/sessions/340a2774-3537-47bb-b6cb-038b55aec114

Co-authored-by: dadhi <39516+dadhi@users.noreply.github.com>

Author: Copilot

src/FastExpressionCompiler.LightExpression/FlatExpression.cs

@@ -1783,14 +1783,16 @@ public bool Eq(ref ExprTree xTree, ref ExprTree yTree)
                     continue;
                 }
 
+                var advanced = false;
                 while (true)
                 {
                     if (remainingSiblings != 0)
                     {
                         xIdx = x.NextIdx;
                         yIdx = y.NextIdx;
                         remainingSiblings--;
-                        goto ContinueTraversal;
+                        advanced = true;
+                        break;
                     }
 
                     if (_eqFrames.Count == 0)
@@ -1804,11 +1806,12 @@ public bool Eq(ref ExprTree xTree, ref ExprTree yTree)
                         xIdx = frame.XNextIdx;
                         yIdx = frame.YNextIdx;
                         remainingSiblings = frame.RemainingSiblingsAfterNode - 1;
-                        goto ContinueTraversal;
+                        advanced = true;
+                        break;
                     }
                 }
-
-            ContinueTraversal:;
+                if (advanced)
+                    continue;
             }
         }