[lld] [llvm] [RISC-V][LLD] Add Support for RISC-V TLSDESC Relocations (PR #66916)

[Tatsuyuki Ishi via llvm-commits]

ishitatsuyuki wrote:

FYI, one limitation of the current TLSDESC spec is that relaxation is a requirement for static binaries to work, since there will be no dynamic linker to fill in the relocs. The relaxation support can come in a separate PR, but it will need to come before enabling TLSDESC by default.

https://github.com/llvm/llvm-project/pull/66916