Rollup merge of #94645 - RalfJung:available-parallelism-miri, r=the8472

do not attempt to open cgroup files under Miri

Since #92697, `cargo miri test` always fails under default flags, and one would have to use `MIRIFLAGS=-Zmiri-disable-isolation cargo miri test` instead. This PR fixes that problem.

Cc `@the8472` `@joshtriplett`

library/std/src/sys/unix/thread.rs

@@ -384,6 +384,11 @@ fn cgroup2_quota() -> usize {
  use crate::path::PathBuf;
 
  let mut quota = usize::MAX;
+ if cfg!(miri) {
+ // Attempting to open a file fails under default flags due to isolation.
+ // And Miri does not have parallelism anyway.
+ return quota;
+ }
 
  let _: Option<()> = try {
  let mut buf = Vec::with_capacity(128);