Auto merge of #110427 - Nilstrieb:parallel-bootstrap-startup, r=albertlarsan68

Parallelize initial Rust download in bootstrap

Parallelize the initial download of Rust in `bootstrap.py`

`time ./x.py --help` after `rm -r build`
Before: 33s
After: 27s
This commit is contained in:
bors 2023-04-30 20:02:00 +00:00
commit b219e06586

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