Fix `x.py doc --stage 1 src/tools/error_index_generator`#84776

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jyn514 wants to merge 2 commits intorust-lang:masterfrom

jyn514:linkcheck-llvm-stage1

Commits on May 1, 2021

Allow running `x.py test src/test/linkchecker` with `download-llvm = true`
jyn514
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Fix `x.py doc --stage 1 src/tools/error_index_generator`
jyn514
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