Auto merge of rust-lang#107987 - EFanZh:inline-poll-methods, r=Mark-Simulacrum

Inline `Poll` methods

With `opt-level="z"`, the `Poll::map*` methods are sometimes not inlined (see <https://godbolt.org/z/ca5ajKTEK>). This PR adds `#[inline]` to these methods. I have a project that can benefit from this change, but do we want to enable this behavior universally?

Fixes rust-lang#101080.

Author: bors

library/core/src/task/poll.rs

@@ -45,6 +45,7 @@ impl<T> Poll<T> {
     /// assert_eq!(poll_some_len, Poll::Ready(13));
     /// ```
     #[stable(feature = "futures_api", since = "1.36.0")]
+    #[inline]
     pub fn map<U, F>(self, f: F) -> Poll<U>
     where
         F: FnOnce(T) -> U,
@@ -144,6 +145,7 @@ impl<T, E> Poll<Result<T, E>> {
     /// assert_eq!(squared, Poll::Ready(Ok(144)));
     /// ```
     #[stable(feature = "futures_api", since = "1.36.0")]
+    #[inline]
     pub fn map_ok<U, F>(self, f: F) -> Poll<Result<U, E>>
     where
         F: FnOnce(T) -> U,
@@ -171,6 +173,7 @@ impl<T, E> Poll<Result<T, E>> {
     /// assert_eq!(res, Poll::Ready(Err(0)));
     /// ```
     #[stable(feature = "futures_api", since = "1.36.0")]
+    #[inline]
     pub fn map_err<U, F>(self, f: F) -> Poll<Result<T, U>>
     where
         F: FnOnce(E) -> U,
@@ -199,6 +202,7 @@ impl<T, E> Poll<Option<Result<T, E>>> {
     /// assert_eq!(squared, Poll::Ready(Some(Ok(144))));
     /// ```
     #[stable(feature = "poll_map", since = "1.51.0")]
+    #[inline]
     pub fn map_ok<U, F>(self, f: F) -> Poll<Option<Result<U, E>>>
     where
         F: FnOnce(T) -> U,
@@ -228,6 +232,7 @@ impl<T, E> Poll<Option<Result<T, E>>> {
     /// assert_eq!(res, Poll::Ready(Some(Err(0))));
     /// ```
     #[stable(feature = "poll_map", since = "1.51.0")]
+    #[inline]
     pub fn map_err<U, F>(self, f: F) -> Poll<Option<Result<T, U>>>
     where
         F: FnOnce(E) -> U,