py/gc: Make gc_dump_info/gc_dump_alloc_table take a printer as argument.

So that callers can redirect the output if needed.

Signed-off-by: Damien George <damien@micropython.org>

shared/runtime/pyexec.c

@@ -167,7 +167,7 @@ STATIC int parse_compile_execute(const void *source, mp_parse_input_kind_t input
         #if MICROPY_ENABLE_GC
         // run collection and print GC info
         gc_collect();
-        gc_dump_info();
+        gc_dump_info(&mp_plat_print);
         #endif
     }
     #endif