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, 45 deletions

diff --git a/src/test/ui/layout/zero-sized-array-enum-niche.rs b/src/test/ui/layout/zero-sized-array-enum-niche.rs
deleted file mode 100644
index 23bbbfbfc58..00000000000
--- a/src/test/ui/layout/zero-sized-array-enum-niche.rs
+++ /dev/null
@@ -1,45 +0,0 @@
-// normalize-stderr-test "pref: Align\([1-8] bytes\)" -> "pref: $$PREF_ALIGN"
-#![feature(rustc_attrs)]
-#![crate_type = "lib"]
-
-// Various tests around the behavior of zero-sized arrays and
-// enum niches, especially that they have coherent size and alignment.
-
-// The original problem in #99836 came from ndarray's `TryFrom` for
-// `SliceInfo<[SliceInfoElem; 0], Din, Dout>`, where that returns
-// `Result<Self, ShapeError>` ~= `Result<AlignedZST, TypeWithNiche>`.
-// This is a close enough approximation:
-#[rustc_layout(debug)]
-type AlignedResult = Result<[u32; 0], bool>; //~ ERROR: layout_of
-// The bug gave that size 1 with align 4, but the size should also be 4.
-// It was also using the bool niche for the enum tag, which is fine, but
-// after the fix, layout decides to use a direct tagged repr instead.
-
-// Here's another case with multiple ZST alignments, where we should
-// get the maximal alignment and matching size.
-#[rustc_layout(debug)]
-enum MultipleAlignments { //~ ERROR: layout_of
-    Align2([u16; 0]),
-    Align4([u32; 0]),
-    Niche(bool),
-}
-
-// Tagged repr is clever enough to grow tags to fill any padding, e.g.:
-// 1.   `T_FF` (one byte of Tag, one byte of padding, two bytes of align=2 Field)
-//   -> `TTFF` (Tag has expanded to two bytes, i.e. like `#[repr(u16)]`)
-// 2.    `TFF` (one byte of Tag, two bytes of align=1 Field)
-//   -> Tag has no room to expand!
-//   (this outcome can be forced onto 1. by wrapping Field in `Packed<...>`)
-#[repr(packed)]
-struct Packed<T>(T);
-
-#[rustc_layout(debug)]
-type NicheLosesToTagged = Result<[u32; 0], Packed<std::num::NonZeroU16>>; //~ ERROR: layout_of
-// Should get tag_encoding: Direct, size == align == 4.
-
-#[repr(u16)]
-enum U16IsZero { _Zero = 0 }
-
-#[rustc_layout(debug)]
-type NicheWinsOverTagged = Result<[u32; 0], Packed<U16IsZero>>; //~ ERROR: layout_of
-// Should get tag_encoding: Niche, size == align == 4.