Add type inference for assignments to properties.

Add type inference for assignments to properties.

This covers explicit property accesses (using both `.` and `?.`) as
well as implicit properties of `this`.

R=scheglov@google.com

Committed: https://github.com/dart-lang/sdk/commit/cdb1e858d201332a847e63bcf97bbd6a48f83101

[Paul Berry, 2017-06-12 17:43:02]

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

[scheglov, 2017-06-12 18:19:02]

LGTM

https://codereview.chromium.org/2931363003/diff/1/pkg/front_end/lib/src/fasta...
File pkg/front_end/lib/src/fasta/kernel/kernel_shadow_ast.dart (right):

https://codereview.chromium.org/2931363003/diff/1/pkg/front_end/lib/src/fasta...
pkg/front_end/lib/src/fasta/kernel/kernel_shadow_ast.dart:1470: if
(nullAwareGuard != null) parts.add('nullAwareGuard=nullAwareGuard');
'nullAwareGuard=$nullAwareGuard'

[Paul Berry, 2017-06-12 18:33:11]

Description was changed from

==========
Add type inference for assignments to properties.

This covers explicit property accesses (using both `.` and `?.`) as
well as implicit properties of `this`.
==========

to

==========
Add type inference for assignments to properties.

This covers explicit property accesses (using both `.` and `?.`) as
well as implicit properties of `this`.

R=scheglov@google.com

Committed:
https://github.com/dart-lang/sdk/commit/cdb1e858d201332a847e63bcf97bbd6a48f83101
==========

[Paul Berry, 2017-06-12 18:33:13]

Committed patchset #1 (id:1) manually as
cdb1e858d201332a847e63bcf97bbd6a48f83101 (presubmit successful).