hadrian stage1:exe:ghc-bin target does not create _build/ghc-stage1

If I make a full build with hadrian I get a ghc-stage1 executable in _build/ghc-stage1, which is just an alias for _build/stage0/bin/ghc.

However if I build the stage1:exe:ghc-bin target, which produces a stage 1 executable in _build/stage1/bin/ghc, it doesn't generate the alias in _build/ghc-stage1.

I think hadrian should generate _build/ghc-stage1 when it generates _build/stage0/bin/ghc.

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