[tests] Add the example from issue 1373 as a test

tests/pretty_printing/issue-1373-ranges.i

+/* run.config
+   STDOPT:
+*/
+
+struct foo { char bar[4]; };
+
+/*@ assigns x->bar[0..3] \from x->bar[0..3]; */
+int f(struct foo* x);
+
+void main() {
+  int a = 0;
+  //@ assert \subset(a, (0..1));
+}

tests/pretty_printing/oracle/issue-1373-ranges.res.oracle

+[kernel] Parsing issue-1373-ranges.i (no preprocessing)
+/* Generated by Frama-C */
+struct foo {
+   char bar[4] ;
+};
+/*@ assigns x->bar[0 .. 3];
+    assigns x->bar[0 .. 3] \from x->bar[0 .. 3]; */
+int f(struct foo *x);
+
+void main(void)
+{
+  int a = 0;
+  /*@ assert \subset(a, (0 .. 1)); */ ;
+  return;
+}
+
+
+[kernel] Parsing ocode_issue-1373-ranges.c (with preprocessing)
+[kernel] Parsing issue-1373-ranges.i (no preprocessing)
+[kernel] issue-1373-ranges.i:10: Warning: 
+  def'n of func main at issue-1373-ranges.i:10 (sum 1968) conflicts with the one at ocode_issue-1373-ranges.c:9 (sum 2855); keeping the one at ocode_issue-1373-ranges.c:9.
+/* Generated by Frama-C */
+struct foo {
+   char bar[4] ;
+};
+/*@ assigns x->bar[0 .. 3];
+    assigns x->bar[0 .. 3] \from x->bar[0 .. 3]; */
+int f(struct foo *x);
+
+void main(void)
+{
+  int a = 0;
+  /*@ assert \subset(a, (0 .. 1)); */ ;
+  return;
+}
+
+