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, 28 insertions, 0 deletions

diff --git a/tests/ui/packed/packed-struct-layout.rs b/tests/ui/packed/packed-struct-layout.rs
new file mode 100644
index 00000000000..d49c222e648
--- /dev/null
+++ b/tests/ui/packed/packed-struct-layout.rs
@@ -0,0 +1,28 @@
+// run-pass
+#![allow(dead_code)]
+use std::mem;
+
+#[repr(packed)]
+struct S4 {
+    a: u8,
+    b: [u8; 3],
+}
+
+#[repr(packed)]
+struct S5 {
+    a: u8,
+    b: u32
+}
+
+pub fn main() {
+    unsafe {
+        let s4 = S4 { a: 1, b: [2,3,4] };
+        let transd : [u8; 4] = mem::transmute(s4);
+        assert_eq!(transd, [1, 2, 3, 4]);
+
+        let s5 = S5 { a: 1, b: 0xff_00_00_ff };
+        let transd : [u8; 5] = mem::transmute(s5);
+        // Don't worry about endianness, the u32 is palindromic.
+        assert_eq!(transd, [1, 0xff, 0, 0, 0xff]);
+    }
+}