Auto merge of #126838 - matthiaskrgr:rollup-qkop22o, r=matthiaskrgr

Rollup of 3 pull requests

Successful merges:

 - #126140 (Rename `std::fs::try_exists` to  `std::fs::exists` and stabilize fs_try_exists)
 - #126318 (Add a `x perf` command for integrating bootstrap with `rustc-perf`)
 - #126552 (Remove use of const traits (and `feature(effects)`) from stdlib)

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

library/std/src/sys/pal/windows/fs.rs

@@ -1531,7 +1531,7 @@ pub fn junction_point(original: &Path, link: &Path) -> io::Result<()> {
 }
 
 // Try to see if a file exists but, unlike `exists`, report I/O errors.
-pub fn try_exists(path: &Path) -> io::Result<bool> {
+pub fn exists(path: &Path) -> io::Result<bool> {
     // Open the file to ensure any symlinks are followed to their target.
     let mut opts = OpenOptions::new();
     // No read, write, etc access rights are needed.

library/std/src/sys_common/fs.rs

@@ -42,7 +42,7 @@ fn remove_dir_all_recursive(path: &Path) -> io::Result<()> {
     fs::remove_dir(path)
 }
 
-pub fn try_exists(path: &Path) -> io::Result<bool> {
+pub fn exists(path: &Path) -> io::Result<bool> {
     match fs::metadata(path) {
         Ok(_) => Ok(true),
         Err(error) if error.kind() == io::ErrorKind::NotFound => Ok(false),

src/bootstrap/src/core/build_steps/mod.rs

@@ -7,6 +7,7 @@ pub(crate) mod doc;
 pub(crate) mod format;
 pub(crate) mod install;
 pub(crate) mod llvm;
+pub(crate) mod perf;
 pub(crate) mod run;
 pub(crate) mod setup;
 pub(crate) mod suggest;