Polyfill 9.7.0

[SimonCropp]

Guard has been re-added for back compat

[Evangelink]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[SimonCropp]

@Evangelink i think the new version needs unlocking??

[Evangelink]

Yes but getting some issues with the mirroring :)

[Evangelink]

@SimonCropp looks like there is something off with SpanAction and ReadOnlySpanActions:

Q:\packages\nuget\polyfill\9.3.2\contentFiles\cs\netstandard2.0\Polyfill\ReadOnlySpanAction.cs(25,35): error CS0246: The type or namespace name 'Read
OnlySpanAction<,>' could not be found (are you missing a using directive or an assembly reference?) [Q:\dev\testfx1\src\Adapter\MSTestAdapter.Platfor
mServices\MSTestAdapter.PlatformServices.csproj::TargetFramework=uap10.0.16299]
Q:\packages\nuget\polyfill\9.3.2\contentFiles\cs\netstandard2.0\Polyfill\SpanAction.cs(25,35): error CS0246: The type or namespace name 'SpanAction<,
>' could not be found (are you missing a using directive or an assembly reference?) [Q:\dev\testfx1\src\Adapter\MSTestAdapter.PlatformServices\MSTest
Adapter.PlatformServices.csproj::TargetFramework=uap10.0.16299]

[Evangelink]

Ping @SimonCropp

[SimonCropp]

@Evangelink i think i have it solved. waiting for CI to confirm. i should have an update for u tomorrow

[SimonCropp]

@Evangelink can u unlock 9.4.0