jit: Fix volatile loads and stores

Related to PR d/110516 but for libgccjit.

2024-01-03  Martin Rodriguez Reboredo  <yakoyoku@gmail.com>

gcc/jit/
	* jit-playback.cc: Append TREE_THIS_VOLATILE and TREE_SIDE_EFFECTS to
	a dereference if underlying type is volatile.

Signed-off-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>

gcc/jit/jit-playback.cc

@@ -1988,6 +1988,10 @@ new_dereference (tree ptr,
   tree datum = fold_build1 (INDIRECT_REF, type, ptr);
   if (loc)
     set_tree_location (datum, loc);
+  if (TYPE_VOLATILE (type)) {
+    TREE_THIS_VOLATILE (datum) = 1;
+    TREE_SIDE_EFFECTS (datum) = 1;
+  }
   return datum;
 }