[llvm] [llvm][ADT] Add wrappers to `std::fill` (PR #146681)

[Longsheng Mou via llvm-commits]

CoTinker wrote:

> Do you also plan to add `uninitialized_fill`?

Sorry, currently, I have no plans to add uninitialized_fill, as it is seldom used.

https://github.com/llvm/llvm-project/pull/146681