(Bloomberg Opinion) -- Once a bastion of political stability in a troubled region, Malaysia faces the prospect of its third government in little more than six months. A war of attrition over the premiership is the last thing the country needs.Gross domestic product shrank 17.1% in the second quarter, the worst performance in East Asia, and deflation is taking root. Prime Minister Muhyiddin Yassin came to power in March, just as the pandemic began rippling through the region. His support never looked very solid. That shaky backdrop has opened the door for the latest leadership challenge. On Wednesday, Anwar Ibrahim, a one-time establishment insider now heading up the opposition, shocked investors by asserting he has more than enough votes in parliament to command a majority and oust Muhyiddin. While Anwar’s announcement hasn’t been matched by public declarations of support, it was jarring enough to push stocks lower and nudge...