Auto merge of #117435 - SparrowLii:nightly_parallel, r=oli-obk,davidtwco

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enable parallel rustc front end in nightly builds

Refers to the [MCP](https://github.com/rust-lang/compiler-team/issues/681), this pr does:
1. Enable the parallel front end in nightly builds, and keep the default number of threads as 1. Then users can use the parallel rustc front end via -Z threads=n option.

2. Set it up to serial front end for beta/stable builds via bootstrap.

3. Switch over the alt builders from parallel rustc to serial, so we have artifacts without parallel to test against the artifacts with parallel.

r? `@oli-obk`

cc `@cjgillot` `@nnethercote` `@bjorn3` `@Kobzol`

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bors 2023-11-06 07:41:22 +00:00

parent 3d78f291b3 8c7bc3e0a2

commit 7e1b0087d7

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