b09f316058
Make `./x.py <cmd> compiler/<crate>` aware of the crate's features Does not fix https://github.com/rust-lang/rust/issues/129727 on its own as the way the parallel-compiler cfg and feature flags are setup being generally incompatible with `resolver = 2` but it progresses on the issue. But this should in theory allow compiler crates to work that do not depend on the parallel compiler stuff (so some leaf crates).
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