[llvm] [ADT] Add SmallVectorImpl::append_range (PR #93384)

[Jakub Kuderski via llvm-commits]

kuhar wrote:

> Are you referring to `llvm::append_range`? `llvm::SmallVector::append_range` proposed here is already a member function.

I'm just trying to figure out whether these two have the same expressive power or if `SmallVector::append_range` can be made more efficient than the generic `llvm::append_range` (similar to, say, a naive generic size function based on `std::distance` vs. calling `std::list::size`).

https://github.com/llvm/llvm-project/pull/93384