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, 0 insertions, 16 deletions

diff --git a/src/test/ui/structs-enums/enum-nullable-simplifycfg-misopt.rs b/src/test/ui/structs-enums/enum-nullable-simplifycfg-misopt.rs
deleted file mode 100644
index a05cf8b93d5..00000000000
--- a/src/test/ui/structs-enums/enum-nullable-simplifycfg-misopt.rs
+++ /dev/null
@@ -1,16 +0,0 @@
-// run-pass
-
-/*!
- * This is a regression test for a bug in LLVM, fixed in upstream r179587,
- * where the switch instructions generated for destructuring enums
- * represented with nullable pointers could be misoptimized in some cases.
- */
-
-enum List<X> { Nil, Cons(X, #[allow(unused_tuple_struct_fields)] Box<List<X>>) }
-pub fn main() {
-    match List::Cons(10, Box::new(List::Nil)) {
-        List::Cons(10, _) => {}
-        List::Nil => {}
-        _ => panic!()
-    }
-}