Top and limit stack addresses.#2227
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This PR changes the way to get stack addresses. Now instead of using only values from the linker file, you can define the top and limit address of the stack in the code.
Two new functions have been added:
port_stack_get_limitandport_stack_get_top.For
atmel-samd,nrfandstm32f4stack addresses are returned using values from the linker file. Forcxd56, the stack addresses have been taken from the task where CircuitPython is running.