Reuse expensive string in js_rti

Reuse expensive string in js_rti

BUG=
R=sigmund@google.com

Committed: https://github.com/dart-lang/sdk/commit/8495283e25192402b86489aa96977cf352324ff5

[sra1, 2016-09-09 21:20:12]

Patchset #1 (id:1) has been deleted

[sra1, 2016-09-10 00:39:27]

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

[Siggi Cherem (dart-lang), 2016-09-10 00:50:40]

lgtm

https://codereview.chromium.org/2326943003/diff/20001/sdk/lib/_internal/js_ru...
File sdk/lib/_internal/js_runtime/lib/js_rti.dart (right):

https://codereview.chromium.org/2326943003/diff/20001/sdk/lib/_internal/js_ru...
sdk/lib/_internal/js_runtime/lib/js_rti.dart:235: if (substitution == null)
return substitution;
nit, feel free to ignore: consider just retuning `null` here? I know this was
just refactored from before, and that what I'm suggesting is equivalent, but it
makes the intention clearer, I think.

[sra1, 2016-09-13 00:22:37]

Description was changed from

==========
Reuse expensive string in js_rti

BUG=
==========

to

==========
Reuse expensive string in js_rti

BUG=
R=sigmund@google.com

Committed:
https://github.com/dart-lang/sdk/commit/8495283e25192402b86489aa96977cf352324ff5
==========

[sra1, 2016-09-13 00:22:39]

Committed patchset #1 (id:20001) manually as
8495283e25192402b86489aa96977cf352324ff5 (presubmit successful).