Microsoft.NET.CrossGen.targets: stop using legacy runtime graph

[tmds]

The .NET 8 SDK is using the new trimmed graph by default, with the exception of Microsoft.NET.CrossGen.targets which is still using the legacy graph.

runtime/src/tasks/Crossgen2Tasks/Microsoft.NET.CrossGen.targets

Line 446 in 7881fe3

RuntimeGraphPath="$(BundledRuntimeIdentifierGraphFile)"

Relates to #90000.

cc @elinor-fung @dsplaisted @ViktorHofer

[ViktorHofer]

@elinor-fung I marked this as 8.0 for now. Please take a look.

[elinor-fung]

I think we want BundledRuntimeIdentifierGraphFile -> RuntimeIdentifierGraphPath to match the change @dsplaisted made for the shipping target in sdk: https://github.com/dotnet/sdk/blob/main/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.CrossGen.targets#L447

[elinor-fung]

Actually, I don't think we can do that until runtime moves to using an SDK that has the trimmed graph (RC1).

[ViktorHofer]

You could the following meanwhile:

$([MSBuild]::ValueOrDefault('$(RuntimeIdentifierGraphPath)', '$(BundledRuntimeIdentifierGraphFile)'))

So it reads from the first property and only if that one isn't set, read from the legacy one.