fix generic const canonicalization bug

fix generic const canonicalization bug, also needed to "fix" issue in resolveMember on generics as this exposed another generics issue.

BUG=540
TEST=frogsh compile - once warnings are errors

Committed: https://code.google.com/p/dart/source/detail?r=1807

[jimhug, 2011-11-23 19:17:35]

TBR

[Jennifer Messerly, 2011-11-23 19:25:59]

lgtm.

I think what we need to do here is move resolveMember to the base class & the
duplication goes away. I did that here:

http://codereview.chromium.org/8679014/diff/1/frog/type.dart

After reaching the stable point in that CL I branched out into more speculative
work, so I didn't check it in. But maybe I should try to land that change now...

[ahe, 2011-11-24 09:06:31]

Changes to listener.dart LGTM!