Add skeleton for arrays in IR

examples/array.c

@@ -1,9 +1,19 @@
-int sum(int len, int p[2][3]) {
-    return 0;
+int sum(int len, int *p) {
+    int result = 0;
+    for (int i = 0; i < len; i++) {
+        result += p[i];
+    }
+
+    return result;
 }
 
 int main() {
-    int a[2][3];
+    int a[5];
+    int len = 5;
+    
+    for (int i = 0; i < len; i++) {
+        a[i] = i;
+    }
 
-    return 0;
+    return sum(len, a) == 10;
 }