Although I have been able to get the IDE to crash before this change, I don't have a simple repro.

Implemented abstract methods must always be public.

Fixes #11444

Pass along the new completion list span if a provider overrides the default one.
Fixes #12919

Allocate less when converting symbols into syntax.
Fixes #12980

address Chuck's PR feedback

Merge dev15 preview4 df into master20160808 190000

Don't embed IBC data in PR builds...

Merge remote-tracking branch 'upstream/dev15-preview4-df' into merge-dev15-preview4-df-into-master20160808-190000

Conflicts:
	src/EditorFeatures/Test2/IntelliSense/CSharpCompletionCommandHandlerTests.vb

Fix restore with from repo with spaces & stop logging every deleted project.json

Small cleanup of streaming FAR.

Fixed broken partial tags in Xml documentation 

We introduce a "ref type" for use in declarations

and complete adjustments due to last (incomplete) merge from master.

Add support for the new async find refs.

Tiny cleanup tweaks to 'remove doc comment node'.

A code fix for a set of Documentation Comment diagnostics returned by the compiler

Overhaul syntax model for deconstruction decl

Remove extraneous IVT...

added initial etw logging to code