Rollup merge of #116289 - linkmauve:patch-1, r=the8472

Add missing #[inline] on AsFd impl for sys::unix::fs::File

This operation should be extremely cheap, at most the `mov` of the underlying file descriptor, but due to this missing `#[inline]` it is currently a function call.

library/std/src/sys/unix/fs.rs

@@ -1391,6 +1391,7 @@ fn from_inner(file_desc: FileDesc) -> Self {
 }
 
 impl AsFd for File {
+    #[inline]
     fn as_fd(&self) -> BorrowedFd<'_> {
         self.0.as_fd()
     }