Let debugger find async function literals

Let debugger find async function literals

This is a fix for issue 22030.

When looking for known functions, consider even non-debuggable
functions, so that we don’t set the breakpoint too eagerly
in the outer function.

R=iposva@google.com

Committed: https://code.google.com/p/dart/source/detail?r=44829

[hausner, 2015-04-01 00:02:33]

hausner@google.com changed reviewers:
+ srdjan@google.com

[Ivan Posva, 2015-04-01 00:11:21]

iposva@google.com changed reviewers:
+ iposva@google.com

[Ivan Posva, 2015-04-01 00:11:21]

LGTM -ip

[hausner, 2015-04-01 00:18:16]

Committed patchset #1 (id:1) manually as r44829 (presubmit successful).

[srdjan, 2015-04-01 16:36:52]

lgtm