VM: [KERNEL] handle single-argument string interpolation in VM

VM: [KERNEL] handle single-argument string interpolation in VM

Also ignore zero-width string pieces when creating
StringConcatenation objects.

Mostly fixes the regressions on CssLib.prettyPrint.

R=ahe@google.com, vegorov@google.com

Committed: https://github.com/dart-lang/sdk/commit/12bbefdbed845e81005f531c10b47684de5edb5f

[Dmitry Olshansky, 2017-03-14 14:38:35]

dmitryolsh@google.com changed reviewers:
+ ahe@google.com, vegorov@google.com

[ahe, 2017-03-14 14:58:44]

Fasta changes: LGTM

https://codereview.chromium.org/2753523002/diff/1/pkg/front_end/lib/src/fasta...
File pkg/front_end/lib/src/fasta/kernel/body_builder.dart (right):

https://codereview.chromium.org/2753523002/diff/1/pkg/front_end/lib/src/fasta...
pkg/front_end/lib/src/fasta/kernel/body_builder.dart:821: // Contains more then
just \' or \".
than.

https://codereview.chromium.org/2753523002/diff/1/pkg/front_end/lib/src/fasta...
pkg/front_end/lib/src/fasta/kernel/body_builder.dart:836: // Contains more then
just \' or \".
Than.

[Dmitry Olshansky, 2017-03-14 15:19:40]

Fixed spelling

[Vyacheslav Egorov (Google), 2017-03-15 15:11:58]

lgtm

[Dmitry Olshansky, 2017-03-16 12:33:35]

Description was changed from

==========
VM: [KERNEL] handle single-argument string interpolation in VM

Also ignore zero-width string pieces when creating
StringConcatenation objects.

Mostly fixes the regressions on CssLib.prettyPrint.
==========

to

==========
VM: [KERNEL] handle single-argument string interpolation in VM

Also ignore zero-width string pieces when creating
StringConcatenation objects.

Mostly fixes the regressions on CssLib.prettyPrint.

R=ahe@google.com, vegorov@google.com

Committed:
https://github.com/dart-lang/sdk/commit/12bbefdbed845e81005f531c10b47684de5edb5f
==========

[Dmitry Olshansky, 2017-03-16 12:33:37]

Committed patchset #2 (id:20001) manually as
12bbefdbed845e81005f531c10b47684de5edb5f (presubmit successful).