Bug 447486 - codan - CCE is thrown by control flow graph builder

- addOutgoing cannot join JumpNode - block will be added to dead list
instead
- addjusted goto code to not use addOutgoing but using setJump directly
- corrected code that doing fake return to deal jump nodes at the end
- corrected code that marks up dead code to remove jump targets
- corrected code that calculates all nodes in the graph to take into
account dangling labels
- fixed CFG viewer to show unconnected labeled statements

Change-Id: Ie4d9e37678e3ebaae8e9f268e6f37342e14a1444
Reviewed-on: https://git.eclipse.org/r/38189
Tested-by: Hudson CI
Reviewed-by: Elena Laskavaia <elaskavaia.cdt@gmail.com>