Initial commit from sysy-main

testdata/functional/26_while_test1.sy

@@ -0,0 +1,18 @@
+int doubleWhile() {
+  int i;
+  i = 5;
+  int j;
+  j = 7;
+  while (i < 100) {
+    i = i + 30;
+    while(j < 100){
+      j = j + 6;
+    }
+    j = j - 100;
+  }
+  return (j);
+}
+
+int main() {
+  return doubleWhile();
+}