Auto merge of #46564 - Zoxc:rayon-queries, r=<try>

WIP: Parallelize passes using rayon

This builds on #46193 and #45912 and actually makes code run in parallel. This is not quite ready yet since `rustc` is not yet completely thread safe. It also uses a rough fork of rayon which uses fibers/stackful coroutines.

src/bootstrap/builder.rs

@@ -254,11 +254,11 @@ impl<'a> Builder<'a> {
                 tool::RustInstaller, tool::Cargo, tool::Rls, tool::Rustdoc, tool::Clippy,
                 native::Llvm, tool::Rustfmt, tool::Miri),
             Kind::Check => describe!(check::Std, check::Test, check::Rustc),
-            Kind::Test => describe!(test::Tidy, test::Bootstrap, test::DefaultCompiletest,
+            Kind::Test => describe!(test::Tidy, test::Bootstrap/*, test::DefaultCompiletest,
                 test::HostCompiletest, test::Crate, test::CrateLibrustc, test::Rustdoc,
                 test::Linkcheck, test::Cargotest, test::Cargo, test::Rls, test::Docs,
                 test::ErrorIndex, test::Distcheck, test::Rustfmt, test::Miri, test::Clippy,
-                test::RustdocJS, test::RustdocTheme),
+                test::RustdocJS, test::RustdocTheme*/),
             Kind::Bench => describe!(test::Crate, test::CrateLibrustc),
             Kind::Doc => describe!(doc::UnstableBook, doc::UnstableBookGen, doc::TheBook,
                 doc::Standalone, doc::Std, doc::Test, doc::Rustc, doc::ErrorIndex, doc::Nomicon,

src/bootstrap/config.rs

@@ -470,7 +470,7 @@ impl Config {
             set(&mut config.quiet_tests, rust.quiet_tests);
             set(&mut config.test_miri, rust.test_miri);
             set(&mut config.wasm_syscall, rust.wasm_syscall);
-            config.rustc_parallel_queries = rust.experimental_parallel_queries.unwrap_or(false);
+            config.rustc_parallel_queries = rust.experimental_parallel_queries.unwrap_or(true);
             config.rustc_default_linker = rust.default_linker.clone();
             config.musl_root = rust.musl_root.clone().map(PathBuf::from);
             config.save_toolstates = rust.save_toolstates.clone().map(PathBuf::from);

src/libarena/Cargo.toml

@@ -7,3 +7,6 @@ version = "0.0.0"
 name = "arena"
 path = "lib.rs"
 crate-type = ["dylib"]
+
+[dependencies]
+rustc_data_structures = { path = "../librustc_data_structures" }