Prevent memcpy overlapping buffers when assigning a CryptoHash to itself
Prevent memcpy overlapping buffers when assigning a CryptoHash to itself

This happens in open_write when assigning the cacheKey to itself

dyrock/trafficserver,chitianhao/trafficserver,davidbz/trafficserver,chitianhao/trafficserver,vmamidi/trafficserver,davidbz/trafficserver,pbchou/trafficserver,chitianhao/trafficserver,pbchou/trafficserver,SolidWallOfCode/trafficserver,duke8253/trafficserver,vmamidi/trafficserver,bryancall/trafficserver,SolidWallOfCode/trafficserver,vmamidi/trafficserver,davidbz/trafficserver,SolidWallOfCode/trafficserver,chitianhao/trafficserver,vmamidi/trafficserver,dyrock/trafficserver,dyrock/trafficserver,duke8253/trafficserver,bryancall/trafficserver,pbchou/trafficserver,davidbz/trafficserver,vmamidi/trafficserver,dyrock/trafficserver,SolidWallOfCode/trafficserver,davidbz/trafficserver,duke8253/trafficserver,SolidWallOfCode/trafficserver,duke8253/trafficserver,bryancall/trafficserver,vmamidi/trafficserver,bryancall/trafficserver,dyrock/trafficserver,bryancall/trafficserver,pbchou/trafficserver,chitianhao/trafficserver,duke8253/trafficserver,bryancall/trafficserver,pbchou/trafficserver,dyrock/trafficserver,davidbz/trafficserver,pbchou/trafficserver,dyrock/trafficserver,duke8253/trafficserver,chitianhao/trafficserver,SolidWallOfCode/trafficserver,duke8253/trafficserver,SolidWallOfCode/trafficserver,chitianhao/trafficserver