Fix ddc perf issue

Fix ddc perf issue

This brings compilation time on large_class_declaration_test down from 30s to 4s.  Just analysis is about 3.2s.  (All #s without snapshotted tools.)

Fixes #29234

R=jmesserly@google.com

Committed: https://github.com/dart-lang/sdk/commit/b98729503cfa65360e9441bab10e9c981ac135ad

[vsm, 2017-04-20 17:09:35]

Description was changed from

==========
Fix ddc perf issue

This brings compilation time on large_class_declaration_test down from 30s to
4s.  Just analysis is about 3.2s.  (All #s without snapshotted tools.)

Fixes #29234
==========

to

==========
Fix ddc perf issue

This brings compilation time on large_class_declaration_test down from 30s to
4s.  Just analysis is about 3.2s.  (All #s without snapshotted tools.)

Fixes #29234
==========

[vsm, 2017-04-20 17:09:35]

vsm@google.com changed reviewers:
+ jmesserly@google.com

[Jennifer Messerly, 2017-04-20 18:15:57]

LGTM^2

[vsm, 2017-04-20 18:24:43]

Description was changed from

==========
Fix ddc perf issue

This brings compilation time on large_class_declaration_test down from 30s to
4s.  Just analysis is about 3.2s.  (All #s without snapshotted tools.)

Fixes #29234
==========

to

==========
Fix ddc perf issue

This brings compilation time on large_class_declaration_test down from 30s to
4s.  Just analysis is about 3.2s.  (All #s without snapshotted tools.)

Fixes #29234

R=jmesserly@google.com

Committed:
https://github.com/dart-lang/sdk/commit/b98729503cfa65360e9441bab10e9c981ac135ad
==========

[vsm, 2017-04-20 18:24:44]

Committed patchset #1 (id:1) manually as
b98729503cfa65360e9441bab10e9c981ac135ad (presubmit successful).