Remove unnecessary code from resize()
Remove unnecessary code from resize()

- In resize, all the values are moved from original hash table are
  copied to the new hash table using memcpy().
- Removed the for loop where values are constructed using 'new' operator, as
  all the values are trivially constructible in the specialized
  aggregation hash table implementation.

UWQuickstep/quickstep,zuyu/incubator-quickstep,jianqiao/incubator-quickstep,cramja/incubator-quickstep,jianqiao/incubator-quickstep,UWQuickstep/quickstep,UWQuickstep/quickstep,jianqiao/incubator-quickstep,hbdeshmukh/incubator-quickstep,tarunbansal/incubator-quickstep,zuyu/incubator-quickstep,hbdeshmukh/incubator-quickstep,tarunbansal/incubator-quickstep,jianqiao/incubator-quickstep,cramja/incubator-quickstep,hbdeshmukh/incubator-quickstep,tarunbansal/incubator-quickstep,cramja/incubator-quickstep,UWQuickstep/quickstep,tarunbansal/incubator-quickstep,zuyu/incubator-quickstep,hbdeshmukh/incubator-quickstep,cramja/incubator-quickstep,UWQuickstep/quickstep,zuyu/incubator-quickstep