Switch how we track whether trackDdcProfile is set to reduce the performance impact. sra was seeing…

Switch how we track whether trackDdcProfile is set to reduce the performance impact. sra was seeing this call hit 14% usage in the chrome profile.


Fill in whitelist call ist and add support for list of whitelists that apply to calls only.

BUG=
R=vsm@google.com

Committed: https://github.com/dart-lang/dev_compiler/commit/c0a7866b58aa558c02e6b05298b723e3f293b6ab

[Jacob, 2016-06-02 23:17:18]

jacobr@google.com changed reviewers:
+ leafp@google.com, vsm@google.com

[Jacob, 2016-06-02 23:17:19]

sra made the good point that checking a property that is undefined is very
expensive. We have a fair amount of other code that also goes down a slow path
because of that.

[vsm, 2016-06-02 23:58:02]

lgtm

[Jacob, 2016-06-02 23:59:36]

Description was changed from

==========
Switch how we track whether trackDdcProfile is set to reduce the performance
impact. sra was seeing this call hit 14% usage in the chrome profile.


Fill in whitelist call ist and add support for list of whitelists that apply to
calls only.

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

to

==========
Switch how we track whether trackDdcProfile is set to reduce the performance
impact. sra was seeing this call hit 14% usage in the chrome profile.


Fill in whitelist call ist and add support for list of whitelists that apply to
calls only.

BUG=
R=vsm@google.com

Committed:
https://github.com/dart-lang/dev_compiler/commit/c0a7866b58aa558c02e6b05298b7...
==========

[Jacob, 2016-06-02 23:59:38]

Committed patchset #1 (id:1) manually as
c0a7866b58aa558c02e6b05298b723e3f293b6ab (presubmit successful).