Auto merge of #56765 - Zoxc:pq-test, r=<try>

[do not merge] Test parallel queries

Let's see if I have more luck

r? @michaelwoerister

Author: bors

src/bootstrap/config.rs

@@ -553,7 +553,7 @@ impl Config {
             set(&mut config.lld_enabled, rust.lld);
             set(&mut config.lldb_enabled, rust.lldb);
             set(&mut config.llvm_tools_enabled, rust.llvm_tools);
-            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/librustc/session/mod.rs

@@ -886,7 +886,7 @@ impl Session {
     /// Returns the number of query threads that should be used for this
     /// compilation
     pub fn query_threads_from_opts(opts: &config::Options) -> usize {
-        opts.debugging_opts.query_threads.unwrap_or(1)
+        opts.debugging_opts.query_threads.unwrap_or(4)
     }
 
     /// Returns the number of query threads that should be used for this