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, 20 deletions

diff --git a/src/test/incremental/cache_file_headers.rs b/src/test/incremental/cache_file_headers.rs
deleted file mode 100644
index 9cf611c3379..00000000000
--- a/src/test/incremental/cache_file_headers.rs
+++ /dev/null
@@ -1,20 +0,0 @@
-// This test case makes sure that the compiler does not try to re-use anything
-// from the incremental compilation cache if the cache was produced by a
-// different compiler version. This is tested by artificially forcing the
-// emission of a different compiler version in the header of rpass1 artifacts,
-// and then making sure that the only object file of the test program gets
-// re-codegened although the program stays unchanged.
-
-// The `l33t haxx0r` Rust compiler is known to produce incr. comp. artifacts
-// that are outrageously incompatible with just about anything, even itself:
-//[rpass1] rustc-env:RUSTC_FORCE_RUSTC_VERSION="l33t haxx0r rustc 2.1 LTS"
-
-// revisions:rpass1 rpass2
-// compile-flags: -Z query-dep-graph
-
-#![feature(rustc_attrs)]
-#![rustc_partition_codegened(module="cache_file_headers", cfg="rpass2")]
-
-fn main() {
-    // empty
-}