[lld] [lld][ELF] Skip zero-sized symbols in balanced partitioning (PR #151685)

[Ellis Hoag via llvm-commits]

ellishg wrote:

Even ignoring section symbols, it doesn't make sense to attempt to order zero sized symbols. I think this could also be applied to MachO. Could you add that too?

https://github.com/llvm/llvm-project/pull/151685