The following ILCompiler projects have RunAnalyzers enabled unconditionally which introduces prebuilts for source-build. Analyzers are not supported by source-build, they are not built as part of source-build graph therefore are considered prebuilts.

ILCompiler.Compiler
ILCompiler.DependencyAnalysisFramework
ILCompiler.MetadataTransform
ILCompiler.RyuJit
ILCompiler.TypeSystem
ILCompiler

Analyzers were enabled as part of #74825. cc @tlakollo

The correct way to enable analyzers is via https://github.com/dotnet/runtime/blob/main/eng/Analyzers.props#L4