(Meta) Implementation issue for Set Literals Q4'18

[JekCharlsonYu]

This issue is for tracking implementation of Set Literals:

Request issue: #36
Feature issue: #37

Implementation Plan
Full proposal
Sign off Doc

Schedule TBD**
Completion goals for the phases:

Task0: Mid November 2018
Task1: November 16, 2018
Task2, Task3: November 30, 2018
Tasks 4-14: December 14, 2018
Task15: December 21, 2018
Task16: January, 2019

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Task0 (Prerequisite)
Covered in Constants Issue Tracker
Task1 : Task0 (Parsing support)

• The CFE implements parsing support for the new literal syntax

Task2 : Task1 (CFE implementation)

• The CFE implements support for set literals

Task3 : Task1 (Analyzer implementation)

• The analyzer implements static checking for set literals

Task4 : Task3 (DDC implementation)

• DDC implements backend support

Task5 : Task2 (VM support)

• VM implements backend support

Task6 : Task2 (dart2js support)

• dart2js implements backend support

Task7 : Task0 (Intellij support)

• IntelliJ parser supports set literals

Task8 : Task1 (Grok support)

• Grok implements any required support

Task9 : Task3 (Dartfmt support)

• Dartfmt implements formatting support

Task9 : Task3 (Dartdoc support)

• Dartdoc implements support

Task10 : (Specification)

• [Add set literals to formal spec]

Task11 : (Documentation)

• [Document in language references]

Task12 : (co19 tests)

• co19 tests written

Task13 : (Language tests)

• Language tests written

Task14 : Task1 (Angular compiler, sourcegen)

• Angular compiler and sourcegen clients support set literals

Task15 : Task14 (Google3 roll)

• [Roll to google3 with flag enabled]

Task16 : * (Launch)

• Remove the experimental flag, enable by default, announce the feature

[JekCharlsonYu]

@mit-mit @leafpetersen

[munificent]

Dartfmt support is published and rolled into the SDK as of: https://dart-review.googlesource.com/c/sdk/+/86581