Add skeleton for arrays in IR

examples/array2.c

@@ -0,0 +1,16 @@
+void init(int row, int col, int a[4][5]) {
+    for (int i = 0; i < row; i++) {
+        for (int j = 0; j < col; j++) {
+            a[i][j] = i * j;
+        }
+    }
+}
+
+int main() {
+    int a[4][5];
+    int row = 4, col = 5;
+
+    init(row, col, a);
+
+    return a[2][3] == 6;
+}