Do not emit unsupported thunks for delegates with allows ref struct generics
#105871
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… generics Fixes dotnet#105029 I looked into redoing delegate thunk management to be per instance but that would be an unnecessarily big diff. Instead adding a facility to allow `ILStubMethodIL` specialize per-instance if needed and in this specialization generate a throwing method body (that should be unreachable at runtime).
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Fixes #105029
I looked into redoing delegate thunk management to be per instance but that would be an unnecessarily big diff. Instead adding a facility to allow
ILStubMethodILspecialize per-instance if needed and in this specialization generate a throwing method body (that should be unreachable at runtime).Cc @dotnet/ilc-contrib