py/objexcept: Optimise mp_obj_new_exception[_arg1/_args] functions.
py/objexcept: Optimise mp_obj_new_exception[_arg1/_args] functions.

This reduces code size by 10-70 bytes on all ports (except cc3200 which has
no change).

tobbad/micropython,bvernoux/micropython,kerneltask/micropython,adafruit/circuitpython,tobbad/micropython,pozetroninc/micropython,pozetroninc/micropython,MrSurly/micropython,adafruit/circuitpython,kerneltask/micropython,tobbad/micropython,pramasoul/micropython,kerneltask/micropython,henriknelson/micropython,selste/micropython,tobbad/micropython,tobbad/micropython,pramasoul/micropython,kerneltask/micropython,pozetroninc/micropython,adafruit/circuitpython,MrSurly/micropython,pramasoul/micropython,MrSurly/micropython,henriknelson/micropython,selste/micropython,bvernoux/micropython,selste/micropython,bvernoux/micropython,pozetroninc/micropython,henriknelson/micropython,adafruit/circuitpython,bvernoux/micropython,pozetroninc/micropython,MrSurly/micropython,MrSurly/micropython,adafruit/circuitpython,henriknelson/micropython,kerneltask/micropython,bvernoux/micropython,adafruit/circuitpython,pramasoul/micropython,pramasoul/micropython,selste/micropython,henriknelson/micropython,selste/micropython