rust/compiler
Matthias Krüger 5115bdc2e2
Rollup merge of #94524 - bjorn3:remove_num_cpus, r=Mark-Simulacrum
Remove num_cpus dependency from bootstrap, build-manifest and rustc_s…

…ession

`std::threads::available_parallelism` was stabilized in rust 1.59.

r? ```````````````````````````@Mark-Simulacrum```````````````````````````
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