Test that goal disjunction clauses are output

Previously the assertion clause set was empty
in this case.

Author: peterschrammel

regression/solver-hardness/solver-hardness-simple/main.c

@@ -5,5 +5,6 @@ int main()
   int a;
   int b;
   assert(a + b < 10);
+  assert(a < 10);
   return 0;
 }

regression/solver-hardness/solver-hardness-simple/test.desc

@@ -5,5 +5,6 @@ main.c
 ^SIGNAL=0$
 ^VERIFICATION FAILED$
 \"SAT_hardness\":\{(\"ClauseSet\":\[.*\]|\"Clauses\":\d+|\"Variables\":\d+|\"Literals\":\d+),(\"ClauseSet\":\[.*\]|\"Clauses\":\d+|\"Variables\":\d+|\"Literals\":\d+),(\"ClauseSet\":\[.*\]|\"Clauses\":\d+|\"Variables\":\d+|\"Literals\":\d+),(\"ClauseSet\":\[.*\]|\"Clauses\":\d+|\"Variables\":\d+|\"Literals\":\d+)\}
+\"GOTO_ID\":32,\"SAT_hardness\":\{\"ClauseSet\":\[.*,571\],\"Clauses\":571
 --
 ^warning: ignoring