Auto merge of #106458 - albertlarsan68:move-tests, r=jyn514

Move src/test to the root

See MCP at rust-lang/compiler-team#573

There may be more changes needed.

The first commit is just the move of the files:
You can check that the first commit did not do anything else than renames by running
```
git diff --diff-filter=r -M100% <rust-lang remote>/master <first commit hash>
```
The output should be empty, because the filter excludes renames, and the match threshold for qualifying a rename is 100%.

The second one is mostly a "find and replace" of `src/test` to `tests` and whatever is needed to make CI pass.

What is left to do:
---

- [x] Move directory
- [ ] Change references to `src/test`
    - [x] Change references in-tree
    - [ ] Change references in submodules / out-of-tree docs
- [x] Make CI pass:
    - [x] Fix tidy
    - [x] Fix tests
    - [x] Bless tests if needed (shouldn't normally)
- [ ] Merge it !

1 files changed, 44 insertions, 0 deletions

diff --git a/tests/ui/threads-sendsync/tls-init-on-init.rs b/tests/ui/threads-sendsync/tls-init-on-init.rs
new file mode 100644
index 00000000000..193c1815105
--- /dev/null
+++ b/tests/ui/threads-sendsync/tls-init-on-init.rs
@@ -0,0 +1,44 @@
+// run-pass
+#![allow(stable_features)]
+
+// ignore-emscripten no threads support
+
+#![feature(thread_local_try_with)]
+
+use std::thread;
+use std::sync::atomic::{AtomicUsize, Ordering};
+
+struct Foo { cnt: usize }
+
+thread_local!(static FOO: Foo = Foo::init());
+
+static CNT: AtomicUsize = AtomicUsize::new(0);
+
+impl Foo {
+    fn init() -> Foo {
+        let cnt = CNT.fetch_add(1, Ordering::SeqCst);
+        if cnt == 0 {
+            FOO.with(|_| {});
+        }
+        Foo { cnt: cnt }
+    }
+}
+
+impl Drop for Foo {
+    fn drop(&mut self) {
+        if self.cnt == 1 {
+            FOO.with(|foo| assert_eq!(foo.cnt, 0));
+        } else {
+            assert_eq!(self.cnt, 0);
+            if FOO.try_with(|_| ()).is_ok() {
+                panic!("should not be in valid state");
+            }
+        }
+    }
+}
+
+fn main() {
+    thread::spawn(|| {
+        FOO.with(|_| {});
+    }).join().unwrap();
+}