Report stack overflow to debugger after stack is unwound

Report stack overflow to debugger after stack is unwound

Notify the debugger of stack overflow errors after the stack has
been unwound. No location information is sent with the pause event.

R=devoncarew@google.com

Committed: https://code.google.com/p/dart/source/detail?r=38125

[hausner, 2014-07-09 21:26:53]

Devon, Jacob, can you check whether the Editor and devtools can handle the
paused event with an empty stack? You can run this code with "pause on
exception" turned on.

class Foo {
  factory Foo.boom() => new Foo.boom();
}

main() {
  new Foo.boom();
}

[devoncarew, 2014-07-09 22:31:07]

lgtm

I patched this in and verified that the editor's debugger handles an empty stack
trace ok.

[hausner, 2014-07-10 17:44:37]

Committed patchset #1 manually as r38125 (presubmit successful).

[hausner, 2014-07-10 17:45:04]

Thank you.