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

[Fangrui Song via llvm-commits]

https://github.com/MaskRay requested changes to this pull request.

Before we do more work with sdata/sbss I think we should consider 
#83093

or at least ensure regular non-baremetal targets don't get weird non-zero -msmall-data-limit=

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