Print should fflush

[DartBot]

This issue was originally filed by rchandia@google.com

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What steps will reproduce the problem?

1. Using the following program (Seq.dart):
2. Run with './Seq.dart | more' (assumes dart is in the path)

What is the expected output? What do you see instead?

Expected to see numbers from 1 to 10 appearing one per second.

Instead all appear when the program finishes.

Likely due to builtin.cc:21 not doing fflush(out);

Possible fix at:
http://codereview.chromium.org/8345009

[DartBot]

This comment was originally written by rchandia@google.com

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Seq.dart:
#!/usr/bin/env dart
void main() {
  int i = 0;
  new Timer((var timer) {
      print(++i);
      if (i >= 10) {
        timer.cancel();
      }
    }, 1000, true);
}

[DartBot]

This comment was originally written by rchandia@google.com

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Fix submitted at r530

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Added Fixed label.