analyzer: fix ICE on bind/connect with a constant fd [PR107928]

analyzer: fix ICE on bind/connect with a constant fd [PR107928]

gcc/analyzer/ChangeLog:
	PR analyzer/107928
	* sm-fd.cc (fd_state_machine::on_bind): Handle m_constant_fd in
	the "success" outcome.
	(fd_state_machine::on_connect): Likewise.
	* sm-fd.dot: Add "constant_fd" state and its transitions.

gcc/testsuite/ChangeLog:
	PR analyzer/107928
	* gcc.dg/analyzer/fd-bind-pr107928.c: New test.
	* gcc.dg/analyzer/fd-connect-pr107928.c: New test.
	* gcc.dg/analyzer/fd-stream-socket-active-open.c
	(test_active_open_from_connect_constant): New, adapted from
	test_active_open_from_connect.
	* gcc.dg/analyzer/fd-stream-socket-passive-open.c
	(test_passive_open_from_bind_constant): New, adapted from
	test_passive_open_from_bind.
	(test_passive_open_from_listen_constant): New, adapted from
	test_passive_open_from_listen.

Signed-off-by: David Malcolm <dmalcolm@redhat.com>