ReferenceFromRuntime aren't resolvable inside VS if the default runtime configuration hasn't been built

[ViktorHofer]

Following up on the discussion here: #36126 (comment).

My recommendation is to get rid of ReferenceFromRuntime items that point to CoreLib and replace them with P2Ps. The P2P would either point to coreclr's or mono's CoreLib.

cc @safern @ericstj @GrabYourPitchforks

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[ericstj]

To make P2P work CoreLib would have to state all its TargetFrameworks and cross-compile by those and not rely on any global properties from a vertical build to determine its content. Is that what you had in mind @ViktorHofer?

[safern]

Related issue: #34653