Build rustdoc only at the topmost stage. #43528
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This effectively ensures that rustdoc will only ever be built once for
any given host. This does not introduce cycles into the build since we
only depend on rustdoc from documentation or test steps, which run after
the required compiler was built.
I've tested locally and
./x.py doc --stage 1 src/libstd
does not build more than all stage0 artifacts and stage1 libstd.I'm not entirely sure that this will work, but I think it should. We'll see if Travis passes.