Auto merge of #80539 - JohnTitor:ui-test-root-cleanup, r=petrochenkov

Reduce the entry on `src/test/ui` (UI test root)

CC #73494, similar to #79776.

r? `@petrochenkov`

src/test/ui/array-slice-vec/array_const_index-1.rs

-// run-pass
-#![allow(dead_code)]
-#![allow(stable_features)]
-
-#![feature(const_indexing)]
+const A: [i32; 0] = [];
+const B: i32 = A[1];
+//~^ index out of bounds: the length is 0 but the index is 1
+//~| ERROR any use of this value will cause an error
 
 fn main() {
-    const ARR: [i32; 6] = [42, 43, 44, 45, 46, 47];
-    const IDX: usize = 3;
-    const VAL: i32 = ARR[IDX];
-    const BLUB: [i32; (ARR[0] - 41) as usize] = [5];
+    let _ = B;
 }

src/test/ui/array-slice-vec/array_const_index-2.rs

+// run-pass
+#![allow(dead_code)]
+#![allow(stable_features)]
+
+#![feature(const_indexing)]
+
+fn main() {
+    const ARR: [i32; 6] = [42, 43, 44, 45, 46, 47];
+    const IDX: usize = 3;
+    const VAL: i32 = ARR[IDX];
+    const BLUB: [i32; (ARR[0] - 41) as usize] = [5];
+}

src/test/ui/array_const_index-1.rs

-const A: [i32; 0] = [];
-const B: i32 = A[1];
-//~^ index out of bounds: the length is 0 but the index is 1
-//~| ERROR any use of this value will cause an error
-
-fn main() {
-    let _ = B;
-}

src/test/ui/auxiliary/trait_superkinds_in_metadata.rs

-// Test library crate for cross-crate usages of traits inheriting
-// from the builtin kinds. Mostly tests metadata correctness.
-
-#![crate_type="lib"]
-
-pub trait RequiresShare : Sync { }
-pub trait RequiresRequiresShareAndSend : RequiresShare + Send { }
-pub trait RequiresCopy : Copy { }

src/test/ui/block-expr-precedence.stderr → src/test/ui/closures/old-closure-expr-precedence.stderr

 warning: unnecessary trailing semicolons
-  --> $DIR/block-expr-precedence.rs:60:21
+  --> $DIR/old-closure-expr-precedence.rs:60:21
    |
 LL |   if (true) { 12; };;; -num;
    |                     ^^ help: remove these semicolons

src/test/ui/block-expression-remove-semicolon.stderr → src/test/ui/closures/old-closure-expression-remove-semicolon.stderr

 error[E0308]: mismatched types
-  --> $DIR/block-expression-remove-semicolon.rs:8:19
+  --> $DIR/old-closure-expression-remove-semicolon.rs:8:19
    |
 LL |       let _x: i32 = {
    |  ___________________^