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, 41 deletions

diff --git a/src/test/ui/simd/array-trait.rs b/src/test/ui/simd/array-trait.rs
deleted file mode 100644
index 45c10b37816..00000000000
--- a/src/test/ui/simd/array-trait.rs
+++ /dev/null
@@ -1,41 +0,0 @@
-// Figuring out the size of a vector type that depends on traits doesn't ICE
-
-#![allow(dead_code)]
-
-// pretty-expanded FIXME #23616
-
-#![feature(repr_simd, platform_intrinsics, generic_const_exprs)]
-#![allow(non_camel_case_types, incomplete_features)]
-
-pub trait Simd {
-    type Lane: Clone + Copy;
-    const SIZE: usize;
-}
-
-pub struct i32x4;
-impl Simd for i32x4 {
-    type Lane = i32;
-    const SIZE: usize = 4;
-}
-
-#[repr(simd)]
-#[derive(Copy, Clone)]
-pub struct T<S: Simd>([S::Lane; S::SIZE]);
-//~^ ERROR unconstrained generic constant
-
-extern "platform-intrinsic" {
-    fn simd_insert<T, E>(x: T, idx: u32, y: E) -> T;
-    fn simd_extract<T, E>(x: T, idx: u32) -> E;
-}
-
-pub fn main() {
-    let mut t = T::<i32x4>([0; 4]);
-    unsafe {
-        for i in 0_i32..4 {
-            t = simd_insert(t, i as u32, i);
-        }
-        for i in 0_i32..4 {
-            assert_eq!(i, simd_extract(t, i as u32));
-        }
-    }
-}