[llvm] [RISCV] Let -data-sections also work on sbss/sdata sections (PR #87040)

[Sam Elliott via llvm-commits]

lenary wrote:

I forgot that a question about backporting this change came up in the RISC-V sync-up. I think we're too late to backport this to 19.x, as it isn't a bugfix, it's an improvement.

https://github.com/llvm/llvm-project/pull/87040