[StaticAnalyzer] Remove several unused declarations

The function definition of GenerateAutoTransition was removed by:

  commit b1d3d968
  Author: Anna Zaks <ganna@apple.com>
  Date:   Thu Oct 27 00:59:23 2011 +0000

The function definitions of enqueueEndOfPath and GenerateCallExitNode
were removed by:

  commit 0ec04bf7
  Author: Anna Zaks <ganna@apple.com>
  Date:   Thu Oct 27 00:59:28 2011 +0000