[llvm] [STLExtras] Introduce bind_{front, back}, [not_]equal_to (PR #175056)

[Yanzuo Liu via llvm-commits]

zwuis wrote:

> Sorry that backporting is more involved than I thought. It is needed to write many code (compared with `bind_{first,last}`) or use C++20 features (lambda capture packs with initializers) although only considering perfect-forwarding bound arguments. Withdrawed.

Sorry that I didn't make it clear. I wanted to withdraw the idea of backporting.

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Current implementation is ok to me if we apply the suggestion in https://github.com/llvm/llvm-project/pull/175056#discussion_r2674092082 and move them to "FunctionalExtras.h" or "STLFunctionalExtras.h".

https://github.com/llvm/llvm-project/pull/175056