repl: call dyld_print_stats on --print-stats

```
=== dyld memory consumption immediately before dyld_clear ===
      <main> mod       4481 (peak       5410) inst     337768 (peak     337768)
   libfoo.so mod       3057 (peak       3341) inst        836 (peak        872)
   libbar.so mod       2384 (peak       2668) inst        660 (peak        696)
    libdl.so mod       1830 (peak       2052) inst        444 (peak        480)
     libc.so mod     191059 (peak     192831) inst      47520 (peak      47556)
   libbaz.so mod       1636 (peak       1822) inst        444 (peak        480)
```

cli/repl.c

@@ -177,6 +177,13 @@ repl_unload_u(struct repl_state *state, struct repl_module_state_u *mod_u)
 #if defined(TOYWASM_ENABLE_DYLD)
         if (state->opts.enable_dyld) {
                 struct dyld *d = &mod_u->u.dyld;
+#if defined(TOYWASM_ENABLE_DYLD)
+                if (state->opts.print_stats) {
+                        nbio_printf("=== dyld memory consumption immediately "
+                                    "before dyld_clear ===\n");
+                        dyld_print_stats(d);
+                }
+#endif
                 dyld_clear(d);
                 return;
         }