Explorer: fix class destructor not called with heap.Delete (#2546)

This change ensures that DestroyAction is executed for the value being deallocated when calling heap.Delete.

Relates to #2521

explorer/testdata/class/new_and_delete.carbon

@@ -0,0 +1,36 @@
+// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
+// Exceptions. See /LICENSE for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+// AUTOUPDATE
+// RUN: %{explorer-run}
+// RUN: %{explorer-run-trace}
+// CHECK:STDOUT: Allocate A
+// CHECK:STDOUT: DESTRUCTOR A
+// CHECK:STDOUT: Delete A
+// CHECK:STDOUT: DESTRUCTOR A
+// CHECK:STDOUT: Return
+// CHECK:STDOUT: result: 0
+
+package ExplorerTest api;
+
+
+class A{
+    fn Create() -> A {
+        return {};
+    }
+    destructor[self: Self] {
+        Print("DESTRUCTOR A");
+    }
+}
+
+fn Main() -> i32 {
+  Print("Allocate A");
+  var pa: A* = heap.New(A.Create());
+
+  Print("Delete A");
+  heap.Delete(pa);
+
+  Print("Return");
+  return 0;
+}

explorer/testdata/class/new_and_delete_hierarchy.carbon

@@ -0,0 +1,44 @@
+// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
+// Exceptions. See /LICENSE for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+// AUTOUPDATE
+// RUN: %{explorer-run}
+// RUN: %{explorer-run-trace}
+// CHECK:STDOUT: Allocate B
+// CHECK:STDOUT: DESTRUCTOR B
+// CHECK:STDOUT: DESTRUCTOR A
+// CHECK:STDOUT: Delete B
+// CHECK:STDOUT: DESTRUCTOR B
+// CHECK:STDOUT: DESTRUCTOR A
+// CHECK:STDOUT: Return
+// CHECK:STDOUT: result: 0
+
+package ExplorerTest api;
+
+
+base class A{
+    destructor[self: Self] {
+        Print("DESTRUCTOR A");
+    }
+}
+
+class B extends A {
+    fn Create() -> Self{
+        return {.base={}};
+    }
+    destructor[self: Self] {
+        Print("DESTRUCTOR B");
+    }
+}
+
+fn Main() -> i32 {
+  Print("Allocate B");
+  var pb: B* = heap.New(B.Create());
+
+  Print("Delete B");
+  heap.Delete(pb);
+
+  Print("Return");
+  return 0;
+}