Update benchmarks readme

Author: HeroicKatora

collector/benchmarks/README.md

@@ -71,9 +71,7 @@ programs.
 - **coercions**: Contains a static array with 65,536 string literals, which
   caused [poor performance](https://github.com/rust-lang/rust/issues/32278) in
   the past.
-- **ctfe-stress-2**: A stress test for compile-time function evaluation.
-- **ctfe-stress-uninit**: A stress test for representation of values with
-  uninitialized bytes in compile-time function evaluation.
+- **ctfe-stress-3**: A stress test for compile-time function evaluation.
 - **deeply-nested**: A small program that caused [exponential
   behavior](https://github.com/rust-lang/rust/issues/38528) in the past.
 - **deep-vector**: A test containing a single large vector of zeroes, which