Cache AnalysisOptionsImpl objects for context directories.

Cache AnalysisOptionsImpl objects for context directories.

This fixes the performance degradation which we had to introduce
in the previous CL.

R=brianwilkerson@google.com
BUG=

Committed: https://github.com/dart-lang/sdk/commit/3d831505a4cf38b50b62421ccab72683ac92e9f0

[Brian Wilkerson, 2017-06-27 19:11:02]

lgtm

https://codereview.chromium.org/2963583002/diff/1/pkg/analyzer_cli/lib/src/dr...
File pkg/analyzer_cli/lib/src/driver.dart (right):

https://codereview.chromium.org/2963583002/diff/1/pkg/analyzer_cli/lib/src/dr...
pkg/analyzer_cli/lib/src/driver.dart:470: // TODO(devoncarew): This needs to
respect analysis_options excludes.
The comment moved. I'm not sure what it was suppose to be associated with, but
assuming it was correct before, perhaps we could move it inside the
_collectFiles method.

[scheglov, 2017-06-27 19:18:46]

Description was changed from

==========
Cache AnalysisOptionsImpl objects for context directories.

This fixes the performance degradation which we had to introduce
in the previous CL.

R=brianwilkerson@google.com
BUG=
==========

to

==========
Cache AnalysisOptionsImpl objects for context directories.

This fixes the performance degradation which we had to introduce
in the previous CL.

R=brianwilkerson@google.com
BUG=

Committed:
https://github.com/dart-lang/sdk/commit/3d831505a4cf38b50b62421ccab72683ac92e9f0
==========

[scheglov, 2017-06-27 19:18:47]

Committed patchset #1 (id:1) manually as
3d831505a4cf38b50b62421ccab72683ac92e9f0 (presubmit successful).