dart2js: --fast-startup: use alias for 'this'

dart2js: --fast-startup: use alias for 'this'

Cache `this` in a local if doing so makes the minified code smaller.

R=floitsch@google.com

Committed: https://github.com/dart-lang/sdk/commit/deb986acce499350b135902c6270e1579081f5bb

Reverted due to https://github.com/dart-lang/sdk/issues/29455

[sra1, 2017-04-19 01:15:21]

Patchset #1 (id:1) has been deleted

[sra1, 2017-04-19 02:38:47]

sra@google.com changed reviewers:
+ floitsch@google.com

[sra1, 2017-04-19 02:38:48]

Saves 0.36% on swarm, 1.67% on a huge angular app.

The generated angular components have fields for very many elements.

[floitsch, 2017-04-19 09:12:59]

LGTM.

[sra1, 2017-04-25 00:53:54]

Description was changed from

==========
dart2js: --fast-startup: use alias for 'this'

Cache `this` in a local if doing so makes the minified code smaller.
==========

to

==========
dart2js: --fast-startup: use alias for 'this'

Cache `this` in a local if doing so makes the minified code smaller.

R=floitsch@google.com

Committed:
https://github.com/dart-lang/sdk/commit/deb986acce499350b135902c6270e1579081f5bb
==========

[sra1, 2017-04-25 00:53:55]

Committed patchset #1 (id:20001) manually as
deb986acce499350b135902c6270e1579081f5bb (presubmit successful).

[sra1, 2017-04-25 19:30:42]

Description was changed from

==========
dart2js: --fast-startup: use alias for 'this'

Cache `this` in a local if doing so makes the minified code smaller.

R=floitsch@google.com

Committed:
https://github.com/dart-lang/sdk/commit/deb986acce499350b135902c6270e1579081f5bb
==========

to

==========
dart2js: --fast-startup: use alias for 'this'

Cache `this` in a local if doing so makes the minified code smaller.

R=floitsch@google.com

Committed:
https://github.com/dart-lang/sdk/commit/deb986acce499350b135902c6270e1579081f5bb

Reverted due to https://github.com/dart-lang/sdk/issues/29455
==========