Rollup merge of rust-lang#136923 - samueltardieu:push-vxxqvqwspssv, r=davidtwco

Lint `#[must_use]` attributes applied to methods in trait impls

The `#[must_use]` attribute has no effect when applied to methods in trait implementations. This PR adds it to the unused `#[must_use]` lint, and cleans the extra attributes in portable-simd and Clippy.

Author: matthiaskrgr

clippy_lints/src/infinite_iter.rs

@@ -94,7 +94,6 @@ impl Finiteness {
 }
 
 impl From<bool> for Finiteness {
-    #[must_use]
     fn from(b: bool) -> Self {
         if b { Infinite } else { Finite }
     }

clippy_utils/src/consts.rs

@@ -351,21 +351,18 @@ pub enum FullInt {
 }
 
 impl PartialEq for FullInt {
-    #[must_use]
     fn eq(&self, other: &Self) -> bool {
         self.cmp(other) == Ordering::Equal
     }
 }
 
 impl PartialOrd for FullInt {
-    #[must_use]
     fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
         Some(self.cmp(other))
     }
 }
 
 impl Ord for FullInt {
-    #[must_use]
     fn cmp(&self, other: &Self) -> Ordering {
         use FullInt::{S, U};