Mark several functions and methods in core::cmp as #[must_use]
Mark several functions and methods in core::cmp as #[must_use]

graydon/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust