Fix CPUX pushm/popm for address words #122
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This patch fixes the "step_pushm_popm" function for the CPUX simulator, which originally 1) decoded PUSHM.A and POPM.A instructions incorrectly and 2) treated all PUSHM/POPM instructions as 16-bit word accesses, which caused programs using 20-bit address words to crash. After patch, simulation of my test binary matched operation on a physical MSP430FR5994.