Support iife heuristic in DDC

Support iife heuristic in DDC

This gives a noticeable 5-10% boost to startup on large internal apps
in Chrome.  We may want to consider for AMD at some point.  It doesn't
apply to es6 or common as those are top-level (and either the browser
or linker would hopefully parse accordingly).

R=jmesserly@google.com

Committed: https://github.com/dart-lang/sdk/commit/6fb0258bf4149552cffce0e7febbfe4d0961c12a

[vsm, 2017-03-14 19:33:43]

Description was changed from

==========
Support iife heuristic in DDC

This gives a noticeable 5-10% boost to startup on large internal apps
in Chrome.  We may want to consider for AMD at some point.  It doesn't
apply to es6 or common as those are top-level (and either the browser
or linker would hopefully parse accordingly).
==========

to

==========
Support iife heuristic in DDC

This gives a noticeable 5-10% boost to startup on large internal apps
in Chrome.  We may want to consider for AMD at some point.  It doesn't
apply to es6 or common as those are top-level (and either the browser
or linker would hopefully parse accordingly).
==========

[vsm, 2017-03-14 19:33:43]

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

[vsm, 2017-03-14 20:46:25]

On 2017/03/14 19:33:49, vsm wrote:

FYI, some background here - https://bugs.chromium.org/p/v8/issues/detail?id=5702

[Jennifer Messerly, 2017-03-14 21:10:26]

lgtm

[vsm, 2017-03-14 21:16:35]

Description was changed from

==========
Support iife heuristic in DDC

This gives a noticeable 5-10% boost to startup on large internal apps
in Chrome.  We may want to consider for AMD at some point.  It doesn't
apply to es6 or common as those are top-level (and either the browser
or linker would hopefully parse accordingly).
==========

to

==========
Support iife heuristic in DDC

This gives a noticeable 5-10% boost to startup on large internal apps
in Chrome.  We may want to consider for AMD at some point.  It doesn't
apply to es6 or common as those are top-level (and either the browser
or linker would hopefully parse accordingly).

R=jmesserly@google.com

Committed:
https://github.com/dart-lang/sdk/commit/6fb0258bf4149552cffce0e7febbfe4d0961c12a
==========

[vsm, 2017-03-14 21:16:36]

Committed patchset #1 (id:1) manually as
6fb0258bf4149552cffce0e7febbfe4d0961c12a (presubmit successful).