dart2js CPS: Fix a bug in the generic Tree transformer.
dart2js CPS: Fix a bug in the generic Tree transformer.

When I was experimenting with inlining, I triggered a violation of the Tree
integrity checker after variable merging, because variable uses in the
typeInformation were not rewritten.

R=asgerf@google.com
BUG=

Review URL: https://codereview.chromium.org//1356903002 .

dartino/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dartino/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk