enable parallel rustc front end in nightly builds

Refers to the [MCP](rust-lang/compiler-team#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`

89: Automated pull from upstream `master` r=Dajamante a=github-actions[bot]


This PR pulls the following changes from the upstream repository:

* rust-lang/rust#117006
* rust-lang/rust#117511
* rust-lang/rust#117641
  * rust-lang/rust#117637
  * rust-lang/rust#117631
  * rust-lang/rust#117516
  * rust-lang/rust#117190
* rust-lang/rust#117292
* rust-lang/rust#117603
* rust-lang/rust#116988
* rust-lang/rust#117630
  * rust-lang/rust#117615
  * rust-lang/rust#117613
  * rust-lang/rust#117592
* rust-lang/rust#117578
* rust-lang/rust#117435
* rust-lang/rust#117607



90: bump serde and serde_derive r=tshepang a=Dajamante

Trying to get around the failure seen in #86 

Co-authored-by: Ralf Jung <[email protected]>
Co-authored-by: Esteban Küber <[email protected]>
Co-authored-by: SparrowLii <[email protected]>
Co-authored-by: Matthias Krüger <[email protected]>
Co-authored-by: Gurinder Singh <[email protected]>
Co-authored-by: Michael Goulet <[email protected]>
Co-authored-by: Thom Chiovoloni <[email protected]>
Co-authored-by: klensy <[email protected]>
Co-authored-by: Jack Huey <31162821 [email protected]>
Co-authored-by: bjorn3 <17426603 [email protected]>
Co-authored-by: hkalbasi <[email protected]>
Co-authored-by: bors <[email protected]>
Co-authored-by: Sven Marnach <[email protected]>
Co-authored-by: Rémy Rakic <remy.rakic [email protected]>
Co-authored-by: aissata <[email protected]>

Update Rust toolchain from nightly-2023-11-06 to nightly-2023-11-07
without any other source changes.
This is an automatically generated pull request. If any of the CI checks
fail, manual intervention is required. In such a case, review the
changes at https://github.com/rust-lang/rust from
rust-lang@fee5518
up to
rust-lang@189d6c7.
The log for this commit range is:
rust-lang@189d6c71f3 Auto merge of
rust-lang#117641 - matthiaskrgr:rollup-f9c12td, r=matthiaskrgr
rust-lang@9efe60b1eb Rollup merge of
rust-lang#117637 - lqd:trivial-bounds-with-binder-vars, r=compiler-errors
rust-lang@2a1f8bccee Rollup merge of
rust-lang#117631 - smarnach:error-request-doc-fix, r=ChrisDenton
rust-lang@8a34fea835 Rollup merge of
rust-lang#117516 - matthiaskrgr:test_effects_113375_oob, r=fee1-dead
rust-lang@1683df7d3b Rollup merge of
rust-lang#117190 - matthiaskrgr:test_effects_113381, r=fee1-dead
rust-lang@fb61292105 Auto merge of
rust-lang#117292 - estebank:issue-80446, r=davidtwco
rust-lang@4b7aacaa4f Silence redundant
error on typo resulting on binop
rust-lang@aea82b268a Auto merge of
rust-lang#117603 - HKalbasi:make-feature-additive, r=Nilstrieb
rust-lang@58351ae03f add test for trivial
bound not holding in `soa-derive`
rust-lang@2beca157c9 check binders with
bound vars for global bounds that don't hold
rust-lang@b049093560 Auto merge of
rust-lang#116988 - RalfJung:null, r=WaffleLapkin
rust-lang@e1fcecb1b9 Auto merge of
rust-lang#117630 - matthiaskrgr:rollup-v0d5p3f, r=matthiaskrgr
rust-lang@3a096e96fa Documentation
cleanup for core::error::Request.
rust-lang@b88d62e222 Rollup merge of
rust-lang#117615 - bjorn3:misc_changes, r=davidtwco
rust-lang@ec35c03143 Rollup merge of
rust-lang#117613 - jackh726:vacation, r=compiler-errors
rust-lang@60dca87cff Rollup merge of
rust-lang#117592 - thomcc:env-span-wrong, r=davidtwco
rust-lang@6bf2fb3679 Auto merge of
rust-lang#117578 - compiler-errors:derive-encode-in-rustc_type_ir, r=davidtwco
rust-lang@f9b644636f Auto merge of
rust-lang#117435 - SparrowLii:nightly_parallel, r=oli-obk,davidtwco
rust-lang@fcca978aa0 Auto merge of
rust-lang#117607 - klensy:clang-17.0.4, r=Mark-Simulacrum
rust-lang@152a4e90d1 Auto merge of
rust-lang#117585 - dnbln:feat/move-kw-span, r=cjgillot
rust-lang@f2a40e99ff use portable
AtomicU64 for powerPC and MIPS
rust-lang@7a892ab8d8 Auto merge of
rust-lang#117576 - the8472:fix-io-copy-vec, r=Mark-Simulacrum
rust-lang@c8a25eddfe Make the randomize
feature of rustc_abi additive
rust-lang@ec29a02071 Update doc comment
for CodegenBackend::link
rust-lang@ba82056a14 Use the actual
computed crate name for -Zprint-vtable-sizes
rust-lang@1a1b10fa63 Don't steal the
parse query when using --pretty
rust-lang@6e33e89337 Remove from vacation
and compiler review group
rust-lang@38ff91c453 bump clang version
for dist-x86_64-linux from 17.0.2 to 17.0.4
rust-lang@86fca873ba Use the correct span
when emitting the `env!` result
rust-lang@c077147200 fix clippy author
and failing test
rust-lang@876f698790 Add the
vis.visit_capture_by() in noop_visit_expr
rust-lang@54ce0346c0 add `fn
visit_capture_by` to MutVisitor and fix pprust-expr-roundtrip.rs
rust-lang@df85b28b72 fixes for rustfmt  
ast visitor
rust-lang@a6b41aa6ba fmt
rust-lang@241a654c07 Fix remaining uses
of `CaptureBy::Value`
rust-lang@8de489918b feat(hir): Store the
`Span` of the `move` keyword
rust-lang@bee7b5889e Derive
TyEncodable/TyDecodable implementations that are parameterized over
interner
rust-lang@78aa5e511c detect EOF earlier
rust-lang@8d8f06b277 avoid excessive
initialization when copying to a Vec
rust-lang@666cad9a5f add test for rust-lang#113375
rust-lang@384f7382ba add test for rust-lang#113381
rust-lang@248dd14fa5 update
config.example.toml
rust-lang@bf5fb7614b update bootstrap
change history
rust-lang@ab8101d019 enable parallel
rustc in nightly builds
rust-lang@231f93524d Detect misparsed
binop caused by missing semi
rust-lang@98d54da1ee document that the
null pointer has the 0 address

---------

Co-authored-by: celinval <[email protected]>
Co-authored-by: Zyad Hassan <[email protected]>
Co-authored-by: Zyad Hassan <88045115 [email protected]>