add test for GC with include in suspended coroutine to check symTable double DELREF

Author: EdmondDantes

tests/edge_cases/011-gc_include_symtable_double_delref.phpt

@@ -0,0 +1,53 @@
+--TEST--
+GC with include in suspended coroutine - symTable double DELREF
+--FILE--
+<?php
+
+use function Async\spawn;
+use function Async\suspend;
+use function Async\await;
+
+class Cycle {
+    public $self;
+}
+
+try {
+    $coroutine = spawn(function() {
+        $parent1 = "value1";
+        $parent2 = "value2";
+
+        for ($i = 0; $i < 10000; $i++) {
+            $obj = new Cycle();
+            $obj->self = $obj;
+        }
+
+        // Suspend - coroutine is now in suspended state
+        suspend();
+
+        // Include inherits parent symTable
+        // Bug: GC may add same variables twice -> double DELREF
+        include __DIR__ . '/011-gc_include_symtable_double_delref_included.inc';
+
+        echo "parent1: {$parent1}\n";
+        echo "parent2: {$parent2}\n";
+        echo "included: {$included}\n";
+
+        return "done";
+    });
+
+    $result = await($coroutine);
+    echo "result: {$result}\n";
+
+} catch (Error $e) {
+    echo "Error: " . $e->getMessage() . "\n";
+}
+
+echo "OK\n";
+gc_collect_cycles();
+?>
+--EXPECTF--
+parent1: value1
+parent2: value2
+included: included_value
+result: done
+OK

tests/edge_cases/011-gc_include_symtable_double_delref_included.inc

@@ -0,0 +1,3 @@
+<?php
+// Included file for GC test
+$included = "included_value";