py/emitnative: Reuse need_reg_all func in need_stack_settled.
py/emitnative: Reuse need_reg_all func in need_stack_settled.

To reduce code size and code duplication.

Signed-off-by: Damien George <99e6b749acbfbe2a596df99e91d24d6e1fdbee00@micropython.org>

bvernoux/micropython,bvernoux/micropython,adafruit/circuitpython,adafruit/circuitpython,adafruit/circuitpython,adafruit/circuitpython,bvernoux/micropython,adafruit/circuitpython,adafruit/circuitpython,bvernoux/micropython,bvernoux/micropython