Support references to unserialized libraries.

Support references to unserialized libraries.

This adds initial support for combining serialized and unserialized libraries
even in the case where the serialized library refers to the unserialized library.

R=sigmund@google.com

Committed: https://github.com/dart-lang/sdk/commit/ac1bc765d9443bda5f1270a7502d79cbb2831364

[Johnni Winther, 2016-05-31 13:34:53]

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

[Siggi Cherem (dart-lang), 2016-05-31 21:43:40]

lgtm

Not sure if we need to support references from serialized to non-serialized...
we might want to make that an error early on instead.

[Johnni Winther, 2016-06-02 08:33:29]

On 2016/05/31 21:43:40, Siggi Cherem (dart-lang) wrote:
> lgtm
> 
> Not sure if we need to support references from serialized to non-serialized...
> we might want to make that an error early on instead.

We should support support cyclic dependencies of the library APIs. 

In the added test, if we change `bar() => foo();` to `bar() { foo(); foo(); }`
then 'a.dart' 
should _not_ need reanalysis even though it refers to 'b.dart' which does need
reanalysis. 

I.e. it can significantly improve the incrementally of the front-end to support
this.

[Johnni Winther, 2016-06-02 08:39:34]

Description was changed from

==========
Support references to unserialized libraries.

This adds initial support for combining serialized and unserialized libraries
even in the case where the serialized library refers to the unserialized
library.
==========

to

==========
Support references to unserialized libraries.

This adds initial support for combining serialized and unserialized libraries
even in the case where the serialized library refers to the unserialized
library.

R=sigmund@google.com

Committed:
https://github.com/dart-lang/sdk/commit/ac1bc765d9443bda5f1270a7502d79cbb2831364
==========

[Johnni Winther, 2016-06-02 08:39:35]

Committed patchset #1 (id:1) manually as
ac1bc765d9443bda5f1270a7502d79cbb2831364 (presubmit successful).