Auto merge of #31977 - bluss:partial-eq-save, r=brson

derive: Avoid emitting provided PartialEq, PartialOrd methods for c-like enums

derive: Avoid emitting provided PartialEq, PartialOrd method for c-like enums

`ne` is completely symmetrical with the method `eq`, and we can save
rust code size and compilation time here if we only emit one of them
when possible.

One case where it's easy to recognize is when it's a C-like enum. Most
other cases can not omit ne, because any value field may have a custom
PartialEq implementation.

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