Introduce a new 'wrap binary expression' (without alignment) refactoring.

Add helpers to make it easy to compute smart-indenting in wrapping refactoring.

* Update dependencies from https://github.com/dotnet/arcade build 20190228.3

This change updates the following dependencies
- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19128.3

* Update dependencies from https://github.com/dotnet/arcade build 20190301.5

This change updates the following dependencies
- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19151.5

* Update dependencies from https://github.com/dotnet/arcade build 20190304.14

This change updates the following dependencies
- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19154.14

* Update dependencies from https://github.com/dotnet/arcade build 20190305.29

This change updates the following dependencies
- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19155.29

* Update dependencies from https://github.com/dotnet/arcade build 20190306.20

This change updates the following dependencies
- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19156.20

* Update dependencies from https://github.com/dotnet/arcade build 20190307.23

This change updates the following dependencies
- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19157.23

* Improve the error message for an 'in' extension method so it's clear why constraining it to a struct wont help.

* Eliminate unspeakable NullableAnnotation values.
* Dynamic invocations result in an oblivious state
Fixes #33638
* Fix up expected diagnostics
Due to #33924
* Rename NullableAnnotation.Unknown to NullableAnnotation.Oblivious

Reduce allocations in CanonicallyCompareDiagnostics

Simplify error code comparison

Code style change based on review.

Defensively call ErrorFacts.PreventsSuccessfulDelegateConversion(xCode), and explain why in a comment.

Move to BYOC pools

Add MakeStatementAsynchronous fixer

Fixes #33905

This changes our pipelines to use the BYOC (Bring Your Own Cloud) pools
hosed by the core engineering team. This is a dynamic queue which should
scale better for our uses than the static pools we are using today.

Test handling of a small selection of lifted built-in unary and binary operators

Enable roll forward in our .NET Core exes

Restore fluent call depth

Remove call to ErrorFacts.PreventsSuccessfulDelegateConversion(xCode), since no longer necessary, and not necessarily an optimisation

This changes our build to mark all of our .NET Core applications as
rolling forward on major / minor versions of the .NET framework.
Presently our tools ship inside both .NET Core 2 and 3 SDKs. This
setting allows our tools to run unmodified in both settings.

closes #25606

The change to move nullable to a two state solution inadverntently
changed how the CLR inlines a number of method calls. The combination of
not-inlining and over-inlining caused us to have a much larger "frame"
for analyzing a fluent call and exceeded our tolerance levels.

This adjusts the inlining so that we get the same results as before.

closes #33775

Classify paramref and typeparamref in Quick Info

* Address minor issues identified in review #32431.
Fixes #32807

Make ITestOutputHelper available to tests

Merge dev16.0 to master

fixed doesn't list 'assembly' keyword

Fixes #33546