Make some trivial functions #[inline(always)]

library/core/src/hint.rs

@@ -160,7 +160,7 @@ pub const unsafe fn unreachable_unchecked() -> ! {
 /// ```
 ///
 /// [`thread::yield_now`]: ../../std/thread/fn.yield_now.html
-#[inline]
+#[inline(always)]
 #[stable(feature = "renamed_spin_loop", since = "1.49.0")]
 pub fn spin_loop() {
     #[cfg(target_arch = "x86")]
@@ -345,6 +345,7 @@ pub const fn black_box<T>(dummy: T) -> T {
 #[unstable(feature = "hint_must_use", issue = "94745")]
 #[rustc_const_unstable(feature = "hint_must_use", issue = "94745")]
 #[must_use] // <-- :)
+#[inline(always)]
 pub const fn must_use<T>(value: T) -> T {
     value
 }