Avoid excess breaks within switch (fix #5344) #5348
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Add new `alwaysJumps` node method to detect when a switch case can safely drop its `break`. Similar to `jumps` but ANDing instead of OR.
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breakwhen the case body exits on its own, typically by a forcedreturnbeing pushed withinifblocks.alwaysJumpsnode method to detect when a switch case cansafely drop its
break. Similar tojumpsbut ANDing instead of OR.jumps, which ignoresthrow; it turns outx = (throw 1)is valid CoffeeScript.