[release/8.0-staging] ILC: Allow OOB reference to upgrade framework assembly #110059
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Backport of #109988 to release/8.0-staging
/cc @sbomer
Customer Impact
Fixes a customer reported issue where the ILC build logic was making it impossible to upgrade FX assemblies via OOB references.
Regression
The inability to upgrade framework assemblies via OOB reference in ILC is not a regression, but changes in the particular OOB package the customer tried made this look like a regression when they upgraded to the latest version of this package.
Testing
Tested locally in a few different configurations:
IlcBuildTasksPath
to point to a local build of the task. Validated ILC picks the 9.0.0 version of the referenced assembly.No automated tests were added because we don't have a good place for this kind of integration test (see discussion in #109988).
Risk
Low. The impact is limited to native AOT scenarios, and is targeted specifically at the scenario where a PackageReference introduces a conflict with a framework assembly. The new error only shows up in scenarios that were already broken, but turns an unpredictable failure mode (failure during ILC with an unhelpful error message about some implementation details) into a predictable one.