dart2js cps: for(;;) is shorter than while(true)

tests/compiler/dart2js/cps_ir/expected/control_flow_3.js

 // Expectation for test: 
 // foo(a) { print(a); return a; }
 // 
 // main() {
 //   for (int i = 0; foo(true); i = foo(i)) {
 //     print(1);
 //     if (foo(false)) break;
 //   }
 //   print(2);
 // }
 
 function() {
-  while (true) {
+  for (;;) {
     P.print(true);
     if (true === true) {
       P.print(1);
       P.print(false);
       if (false !== true) {
         P.print(0);
         continue;
       }
     }
     P.print(2);
     return null;
   }
 }