esp32s2: Correct port_stack_get_top() #3668
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The main stack is bigger than
CONFIG_ESP_MAIN_TASK_STACK_SIZE-- an "extra" size is added to it (TASK_EXTRA_STACK_SIZE). This total size is available asESP_TASK_MAIN_STACK. PresumablyTASK_EXTRA_STACK_SIZEis additional stack that can be used by the esp-idf runtime. But what's important for us is that some very outermost stack frames, such aspyexec_friendly_repl, could lie inside the "extra" area and be invisible to the garbage collector.Closes #3649