Test --call-graph and --reachable-call-graph

Make sure that changes to call_grapht do not alter these two options
to goto-instrument

Author: Owen Jones

regression/goto-instrument/call-graph1/main.c

@@ -0,0 +1,75 @@
+
+int x;
+
+void func0()
+{
+  func0();
+}
+
+void func1()
+{
+  x = 1;
+}
+
+void func2()
+{
+  x = 2;
+  func3();
+}
+
+void func3()
+{
+  x = 3;
+}
+
+void func4()
+{
+  x = 4;
+  func5();
+}
+
+void func5()
+{
+  x = 5;
+  func4();
+}
+
+void func6()
+{
+  x = 6;
+}
+
+void func7()
+{
+  x = 7;
+  func8();
+}
+
+void func8()
+{
+  x = 8;
+  func7();
+}
+
+void func9()
+{
+  x = 9;
+  funca();
+}
+
+void funca()
+{
+  x = 10;
+  func9();
+}
+
+
+
+int main()
+{
+  func1();
+  func2();
+  func4();
+
+  return 0;
+}

regression/goto-instrument/call-graph1/test.desc

@@ -0,0 +1,20 @@
+CORE
+main.c
+--call-graph
+^EXIT=0$
+^SIGNAL=0$
+^main -> func2$
+^main -> func1$
+^main -> func4$
+^funca -> func9$
+^func9 -> funca$
+^func8 -> func7$
+^func7 -> func8$
+^__CPROVER__start -> __CPROVER_initialize$
+^__CPROVER__start -> main$
+^func2 -> func3$
+^func0 -> func0$
+^func4 -> func5$
+^func5 -> func4$
+--
+^warning: ignoring

regression/goto-instrument/reachable-call-graph1/main.c

@@ -0,0 +1,75 @@
+
+int x;
+
+void func0()
+{
+  func0();
+}
+
+void func1()
+{
+  x = 1;
+}
+
+void func2()
+{
+  x = 2;
+  func3();
+}
+
+void func3()
+{
+  x = 3;
+}
+
+void func4()
+{
+  x = 4;
+  func5();
+}
+
+void func5()
+{
+  x = 5;
+  func4();
+}
+
+void func6()
+{
+  x = 6;
+}
+
+void func7()
+{
+  x = 7;
+  func8();
+}
+
+void func8()
+{
+  x = 8;
+  func7();
+}
+
+void func9()
+{
+  x = 9;
+  funca();
+}
+
+void funca()
+{
+  x = 10;
+  func9();
+}
+
+
+
+int main()
+{
+  func1();
+  func2();
+  func4();
+
+  return 0;
+}

regression/goto-instrument/reachable-call-graph1/test.desc

@@ -0,0 +1,20 @@
+CORE
+main.c
+--reachable-call-graph
+^EXIT=0$
+^SIGNAL=0$
+^main -> func2$
+^main -> func1$
+^main -> func4$
+^__CPROVER__start -> __CPROVER_initialize$
+^__CPROVER__start -> main$
+^func2 -> func3$
+^func4 -> func5$
+^func5 -> func4$
+--
+^funca -> func9$
+^func9 -> funca$
+^func8 -> func7$
+^func7 -> func8$
+^func0 -> func0$
+^warning: ignoring