Fix stack frame index numbers for full stack traces

Fix stack frame index numbers for full stack traces

It used to be:
#0      getCurrentStackTrace (file:///tmp/junk.dart:3:5)
#0      func1 (file:///tmp/junk.dart:10:29)
#1      func2 (file:///tmp/junk.dart:14:8)
#2      func3 (file:///tmp/junk.dart:18:8)
#3      func4 (file:///tmp/junk.dart:22:8)
#4      main (file:///tmp/junk.dart:26:8)
(Notice the two #0 frames on top).

Now it will print this as:
#0      getCurrentStackTrace (file:///tmp/junk.dart:3:5)
#1      func1 (file:///tmp/junk.dart:10:29)
#2      func2 (file:///tmp/junk.dart:14:8)
#3      func3 (file:///tmp/junk.dart:18:8)
#4      func4 (file:///tmp/junk.dart:22:8)
#5      main (file:///tmp/junk.dart:26:8)
Committed: https://code.google.com/p/dart/source/detail?r=19272

[hausner, 2013-03-01 02:55:28]

lgtm

[siva, 2013-03-01 03:00:56]

Committed patchset #1 manually as r19272 (presubmit successful).