Move summary references into UnlinkedUnit and PrelinkedUnit.

Move summary references into UnlinkedUnit and PrelinkedUnit.

This is a follow up to commit
f85684604b28449cb5946ed855983678f69e432f, which reorganized the
declarations by compilation unit to pave the way for allowing
summaries to be "re-linked" if the relationship between part files
changes.  Organizing references by compilation unit is another
necessary step to make that possible.

R=scheglov@google.com

Committed: https://github.com/dart-lang/sdk/commit/518ae623d6ccdc355237dd97d6b19fc4d5fcb0e6

[Paul Berry, 2015-12-15 18:01:44]

paulberry@google.com changed reviewers:
+ scheglov@google.com

[scheglov, 2015-12-15 18:46:25]

LGTM

[Paul Berry, 2015-12-15 18:55:53]

Description was changed from

==========
Move summary references into UnlinkedUnit and PrelinkedUnit.

This is a follow up to commit
f85684604b28449cb5946ed855983678f69e432f, which reorganized the
declarations by compilation unit to pave the way for allowing
summaries to be "re-linked" if the relationship between part files
changes.  Organizing references by compilation unit is another
necessary step to make that possible.
==========

to

==========
Move summary references into UnlinkedUnit and PrelinkedUnit.

This is a follow up to commit
f85684604b28449cb5946ed855983678f69e432f, which reorganized the
declarations by compilation unit to pave the way for allowing
summaries to be "re-linked" if the relationship between part files
changes.  Organizing references by compilation unit is another
necessary step to make that possible.

R=scheglov@google.com

Committed:
https://github.com/dart-lang/sdk/commit/518ae623d6ccdc355237dd97d6b19fc4d5fcb0e6
==========

[Paul Berry, 2015-12-15 18:55:54]

Committed patchset #1 (id:1) manually as
518ae623d6ccdc355237dd97d6b19fc4d5fcb0e6 (presubmit successful).