Rollup merge of #143370 - hkBst:clippy-fix-4, r=tgross35

remove redundant #[must_use]

Fixes these clippy warnings:
```
warning: this function has a `#[must_use]` attribute with no message, but returns a type already marked as `#[must_use]`
    --> library/core/src/cmp.rs:1456:5
     |
1456 |     fn __chaining_lt(&self, other: &Rhs) -> ControlFlow<bool> {
     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     |
     = help: either add some descriptive message or remove the attribute
     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#double_must_use
     = note: `-D clippy::double-must-use` implied by `-D warnings`
     = help: to override `-D warnings` add `#[allow(clippy::double_must_use)]`

warning: this function has a `#[must_use]` attribute with no message, but returns a type already marked as `#[must_use]`
    --> library/core/src/cmp.rs:1465:5
     |
1465 |     fn __chaining_le(&self, other: &Rhs) -> ControlFlow<bool> {
     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     |
     = help: either add some descriptive message or remove the attribute
     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#double_must_use

warning: this function has a `#[must_use]` attribute with no message, but returns a type already marked as `#[must_use]`
    --> library/core/src/cmp.rs:1474:5
     |
1474 |     fn __chaining_gt(&self, other: &Rhs) -> ControlFlow<bool> {
     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     |
     = help: either add some descriptive message or remove the attribute
     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#double_must_use

warning: this function has a `#[must_use]` attribute with no message, but returns a type already marked as `#[must_use]`
    --> library/core/src/cmp.rs:1483:5
     |
1483 |     fn __chaining_ge(&self, other: &Rhs) -> ControlFlow<bool> {
     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     |
     = help: either add some descriptive message or remove the attribute
     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#double_must_use
```

Author: jhpratt