[lld] [ELF] Support R_RISCV_SET_ULEB128/R_RISCV_SUB_ULEB128 in non-SHF_ALLOC sections (PR #72610)

[Paul Kirth via llvm-commits]

ilovepi wrote:

@MaskRay We've seen some issues [building Fuchsia](https://ci.chromium.org/ui/p/turquoise/builders/global.try/bringup.riscv64-debug/b8764739883163241713/overview) since https://github.com/llvm/llvm-project/commit/1df5ea29b43690b6622db2cad7b745607ca4de6a landed. We've been triaging a variety of other issues the were breaking the build, so this wasn't noticed, but now that they're cleared up we're seeing these regularly when evaluating new Toolchains.

>From what I can tell, this patch should fix those types of errors, correct?

https://github.com/llvm/llvm-project/pull/72610