[tests] add test for RTE issue mentioned in MR !2261

tests/rte/array_index.c

@@ -44,4 +44,7 @@ void main(int i, int j, unsigned int k) {
   s.t[k] = 0;
   s.s.u[k] = 0;
   s.v[k].t[c[k]] = 0;
+
+  int x;
+  int t[100 / sizeof(x)];
 }

tests/rte/oracle/array_index.0.res.oracle

@@ -20,6 +20,8 @@ ts s;
 unsigned int c[10];
 void main(int i, int j, unsigned int k)
 {
+  int x;
+  int t_0[(unsigned int)100 / sizeof(x)];
   t[0] = 0;
   u[1] = 0;
   v[2][3] = 0;
@@ -89,6 +91,8 @@ ts s;
 unsigned int c[10];
 void main(int i, int j, unsigned int k)
 {
+  int x;
+  int t_0[(unsigned int)100 / sizeof(x)];
   /*@ assert rte: index_bound: 0 ≤ 0; */
   /*@ assert rte: index_bound: 0 < 10; */
   t[0] = 0;

tests/rte/oracle/array_index.1.res.oracle

@@ -20,6 +20,8 @@ ts s;
 unsigned int c[10];
 void main(int i, int j, unsigned int k)
 {
+  int x;
+  int t_0[(unsigned int)100 / sizeof(x)];
   t[0] = 0;
   u[1] = 0;
   v[2][3] = 0;