fix sanitizer tests

compiler/rustc_index/src/lib.rs

@@ -1,6 +1,5 @@
 #![feature(allow_internal_unstable)]
 #![feature(bench_black_box)]
-#![feature(const_fn)]
 #![feature(const_panic)]
 #![feature(extend_one)]
 #![feature(iter_zip)]

src/test/ui/sanitize/address.rs

@@ -7,7 +7,7 @@
 // error-pattern: AddressSanitizer: stack-buffer-overflow
 // error-pattern: 'xs' (line 15) <== Memory access at offset
 
-#![feature(test)]
+#![feature(bench_black_box)]
 
 use std::hint::black_box;
 

src/test/ui/sanitize/hwaddress.rs

@@ -7,7 +7,7 @@
 // run-fail
 // error-pattern: HWAddressSanitizer: tag-mismatch
 
-#![feature(test)]
+#![feature(bench_black_box)]
 
 use std::hint::black_box;
 

src/test/ui/sanitize/leak.rs

@@ -6,7 +6,7 @@
 // run-fail
 // error-pattern: LeakSanitizer: detected memory leaks
 
-#![feature(test)]
+#![feature(bench_black_box)]
 
 use std::hint::black_box;
 use std::mem;

src/test/ui/sanitize/memory.rs

@@ -13,7 +13,7 @@
 
 #![feature(core_intrinsics)]
 #![feature(start)]
-#![feature(test)]
+#![feature(bench_black_box)]
 
 use std::hint::black_box;
 use std::mem::MaybeUninit;