CN: explicit split_case in funptr tests

It works. It could use a less verbose version.

tests/cn/fun_addrs_cn_stmt.c

@@ -0,0 +1,29 @@
+
+int global_x;
+void *global_void_ptr;
+
+extern int extern_f (void);
+
+int
+g (int x)
+{
+  return 0;
+}
+
+/*@
+function ({u32 x1, u32 x2}) get_globals ()
+  { {x1: (u32) (&g), x2: (u32) (&extern_f)} }
+@*/
+
+int
+f (int x)
+/*@ accesses global_x @*/
+{
+  /* resolution of the 'g' & 'extern_f' addrs triggered a bug at one point */
+  /*@ assert (((u32) (&x)) == ((u32) (&x))); @*/;
+  /*@ assert (((u32) (&global_x)) == ((u32) (&global_x))); @*/;
+  /*@ assert (get_globals () == get_globals ()); @*/;
+  /*@ assert (((u32) (&g)) == ((u32) (&g))); @*/;
+
+  return x == global_x;
+}

tests/cn/fun_ptr_extern.c

@@ -47,6 +47,8 @@ call_site (int x, int y) {
   int z;
 
   g2 = get_int_binop(y);
+  /*@ split_case (ptr_eq (g2, &f1)) @*/;
+  /*@ split_case (ptr_eq (g2, &f2)) @*/;
   z = g2 (x, y);
 
   return z;

tests/cn/fun_ptr_three_opts.c

@@ -63,6 +63,9 @@ call_site (int x, int y) {
   int z;
 
   g2 = get_int_binop(y);
+  /*@ split_case (ptr_eq (g2, &f1)); @*/;
+  /*@ split_case (ptr_eq (g2, &f2)); @*/;
+  /*@ split_case (ptr_eq (g2, &f3)); @*/;
   z = g2 (x, y);
 
   return z;