Synchronize the lookup-and-define-class logic in blackbird (2.13 cherry pick of #172) #173
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If blackbird attempts to access/define a new class concurrently, it can hit a race condition between attempting to access it and defining it when that fails. If it does fail, enter a synchronized block and try again before defining the access class. Should fix FasterXML#169
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If blackbird attempts to access/define a new class concurrently,
it can hit a race condition between attempting to access it and
defining it when that fails. If it does fail, enter a synchronized
block and try again before defining the access class.
Should fix #169