Surviving difficult times to live another day is a subtle art in Asian politics. From Myanmar’s Aung San Suu Kyi to Begum Khaleda Zia of Bangladesh, some politicians seem to shuttle back and forth between sprawling palaces and tiny jail cells. One man has honed his survival skills to perfection. Nawaz Sharif, who has led nuclear-armed Pakistan as prime minister three times, is the front runner in Thursday’s elections. Sharif, 74, was removed three times by powerful generals and judges, has been jailed more than once, forced into exile twice, accused of corruption, intimidated and written off b…