Rollup merge of #92775 - xfix:osstringext-inline, r=m-ou-se

Inline std::os::unix::ffi::OsStringExt methods

Those methods essentially do nothing at assembly level. On Unix systems, `OsString` is represented as a `Vec` without performing any transformations.

library/std/src/os/unix/ffi/os_str.rs

@@ -28,9 +28,11 @@ pub trait OsStringExt: Sealed {
 
 #[stable(feature = "rust1", since = "1.0.0")]
 impl OsStringExt for OsString {
+    #[inline]
     fn from_vec(vec: Vec<u8>) -> OsString {
         FromInner::from_inner(Buf { inner: vec })
     }
+    #[inline]
     fn into_vec(self) -> Vec<u8> {
         self.into_inner().inner
     }