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Auto merge of #143035 - ywxt:less-work-steal, r=oli-obk
Only work-steal in the main loop for rustc_thread_pool
This PR is a replica of <https://github.com/rust-lang/rustc-rayon/pull/12> that only retained work-steal in the main loop for rustc_thread_pool.
r? `@oli-obk`
cc `@SparrowLii` `@Zoxc` `@cuviper`
Updates rust-lang/rust#113349
