Move some tests to more reasonable directories

Author: c410-f3r

src/test/ui/issues/issue-73541-3.rs renamed to src/test/ui/async-await/issue-73541-3.rs

@@ -7,8 +7,8 @@ use std::path::Path;
 
 const ENTRY_LIMIT: usize = 1000;
 // FIXME: The following limits should be reduced eventually.
-const ROOT_ENTRY_LIMIT: usize = 968;
-const ISSUES_ENTRY_LIMIT: usize = 2147;
+const ROOT_ENTRY_LIMIT: usize = 950;
+const ISSUES_ENTRY_LIMIT: usize = 2141;
 
 fn check_entries(path: &Path, bad: &mut bool) {
     let dirs = walkdir::WalkDir::new(&path.join("test/ui"))