Revert "Auto merge of #89709 - clemenswasser:apply_clippy_suggestions_2, r=petrochenkov"

The PR had some unforseen perf regressions that are not as easy to find.
Revert the PR for now.

This reverts commit 6ae8912a3e, reversing
changes made to 86d6d2b738.

compiler/rustc_data_structures/src/sso/map.rs

@@ -257,7 +257,11 @@ impl<K: Eq + Hash, V> SsoHashMap<K, V> {
     pub fn remove(&mut self, key: &K) -> Option<V> {
         match self {
             SsoHashMap::Array(array) => {
-                array.iter().position(|(k, _v)| k == key).map(|index| array.swap_remove(index).1)
+                if let Some(index) = array.iter().position(|(k, _v)| k == key) {
+                    Some(array.swap_remove(index).1)
+                } else {
+                    None
+                }
             }
             SsoHashMap::Map(map) => map.remove(key),
         }
@@ -268,7 +272,11 @@ impl<K: Eq + Hash, V> SsoHashMap<K, V> {
     pub fn remove_entry(&mut self, key: &K) -> Option<(K, V)> {
         match self {
             SsoHashMap::Array(array) => {
-                array.iter().position(|(k, _v)| k == key).map(|index| array.swap_remove(index))
+                if let Some(index) = array.iter().position(|(k, _v)| k == key) {
+                    Some(array.swap_remove(index))
+                } else {
+                    None
+                }
             }
             SsoHashMap::Map(map) => map.remove_entry(key),
         }
@@ -415,14 +423,14 @@ impl<K, V> IntoIterator for SsoHashMap<K, V> {
 
 /// adapts Item of array reference iterator to Item of hashmap reference iterator.
 #[inline(always)]
-fn adapt_array_ref_it<K, V>(pair: &(K, V)) -> (&K, &V) {
+fn adapt_array_ref_it<K, V>(pair: &'a (K, V)) -> (&'a K, &'a V) {
     let (a, b) = pair;
     (a, b)
 }
 
 /// adapts Item of array mut reference iterator to Item of hashmap mut reference iterator.
 #[inline(always)]
-fn adapt_array_mut_it<K, V>(pair: &mut (K, V)) -> (&K, &mut V) {
+fn adapt_array_mut_it<K, V>(pair: &'a mut (K, V)) -> (&'a K, &'a mut V) {
     let (a, b) = pair;
     (a, b)
 }

compiler/rustc_data_structures/src/sso/set.rs

@@ -75,7 +75,7 @@ impl<T> SsoHashSet<T> {
     /// An iterator visiting all elements in arbitrary order.
     /// The iterator element type is `&'a T`.
     #[inline]
-    pub fn iter(&self) -> impl Iterator<Item = &T> {
+    pub fn iter(&'a self) -> impl Iterator<Item = &'a T> {
         self.into_iter()
     }