Move exit guard from sys::common::exit_guard to sys::exit_guard.

library/std/src/rt.rs

@@ -146,8 +146,7 @@ fn lang_start_internal(
     panic::catch_unwind(cleanup).map_err(rt_abort)?;
     // Guard against multple threads calling `libc::exit` concurrently.
     // See the documentation for `unique_thread_exit` for more information.
-    panic::catch_unwind(|| crate::sys::common::exit_guard::unique_thread_exit())
-        .map_err(rt_abort)?;
+    panic::catch_unwind(|| crate::sys::exit_guard::unique_thread_exit()).map_err(rt_abort)?;
     ret_code
 }
 

library/std/src/sys/mod.rs

@@ -3,6 +3,7 @@
 /// descriptors.
 mod pal;
 
+pub(crate) mod exit_guard;
 mod personality;
 
 pub mod backtrace;

library/std/src/sys/pal/common/mod.rs

@@ -11,7 +11,6 @@
 #![allow(dead_code)]
 
 pub mod alloc;
-pub mod exit_guard;
 pub mod small_c_string;
 
 #[cfg(test)]

library/std/src/sys/pal/unix/os.rs

@@ -758,7 +758,7 @@ pub fn home_dir() -> Option<PathBuf> {
 }
 
 pub fn exit(code: i32) -> ! {
-    crate::sys::common::exit_guard::unique_thread_exit();
+    crate::sys::exit_guard::unique_thread_exit();
     unsafe { libc::exit(code as c_int) }
 }