[llvm] [NFC][RABasic] Use `std::move` to avoid copy (PR #157825)

[Abhishek Kaushik via llvm-commits]

abhishek-kaushik22 wrote:

> Can't we make RegAllocFilterFunc a raw function pointer instead? I think none of the users require captures and std::function is inefficient.

I will try and update here. Thanks!

https://github.com/llvm/llvm-project/pull/157825