Sort open handles by generation in HPy debug context

Author: fangerer

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/GraalHPyDebugModuleBuiltins.java

@@ -132,6 +132,7 @@ PList doInt(VirtualFrame frame, int generation) {
         private static Object[] getOpenDebugHandles(GraalHPyDebugContext debugContext, int generation) {
             ArrayList<GraalHPyHandle> openHandles = debugContext.getOpenHandles(generation);
             int n = openHandles.size();
+            openHandles.sort((a, b) -> Integer.compare(debugContext.getGenerationForHandle(b), debugContext.getGenerationForHandle(a)));
             Object[] result = new Object[n];
             PythonObjectFactory factory = PythonObjectFactory.getUncached();
             // do reverse order to match order expected by HPy tests

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/cext/hpy/GraalHPyDebugContext.java

@@ -93,6 +93,10 @@ public int getCurrentGeneration() {
         return currentGeneration;
     }
 
+    public int getGenerationForHandle(GraalHPyHandle handle) {
+        return generationTable[handle.getIdDebug(this)];
+    }
+
     public int newGeneration() {
         return ++currentGeneration;
     }