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, 50 deletions

diff --git a/src/test/ui/structs-enums/enum-layout-optimization.rs b/src/test/ui/structs-enums/enum-layout-optimization.rs
deleted file mode 100644
index 05d297906c3..00000000000
--- a/src/test/ui/structs-enums/enum-layout-optimization.rs
+++ /dev/null
@@ -1,50 +0,0 @@
-// run-pass
-// Test that we will do various size optimizations to enum layout, but
-// *not* if `#[repr(u8)]` or `#[repr(C)]` is passed. See also #40029.
-
-#![allow(dead_code)]
-
-use std::mem;
-
-enum Nullable<T> {
-    Alive(T),
-    Dropped,
-}
-
-#[repr(u8)]
-enum NullableU8<T> {
-    Alive(T),
-    Dropped,
-}
-
-#[repr(C)]
-enum NullableC<T> {
-    Alive(T),
-    Dropped,
-}
-
-struct StructNewtype<T>(T);
-
-#[repr(C)]
-struct StructNewtypeC<T>(T);
-
-enum EnumNewtype<T> { Variant(T) }
-
-#[repr(u8)]
-enum EnumNewtypeU8<T> { Variant(T) }
-
-#[repr(C)]
-enum EnumNewtypeC<T> { Variant(T) }
-
-fn main() {
-    assert!(mem::size_of::<Box<i32>>() == mem::size_of::<Nullable<Box<i32>>>());
-    assert!(mem::size_of::<Box<i32>>() < mem::size_of::<NullableU8<Box<i32>>>());
-    assert!(mem::size_of::<Box<i32>>() < mem::size_of::<NullableC<Box<i32>>>());
-
-    assert!(mem::size_of::<i32>() == mem::size_of::<StructNewtype<i32>>());
-    assert!(mem::size_of::<i32>() == mem::size_of::<StructNewtypeC<i32>>());
-
-    assert!(mem::size_of::<i32>() == mem::size_of::<EnumNewtype<i32>>());
-    assert!(mem::size_of::<i32>() < mem::size_of::<EnumNewtypeU8<i32>>());
-    assert!(mem::size_of::<i32>() < mem::size_of::<EnumNewtypeC<i32>>());
-}