[flang] [clang] [libunwind] [libc] [mlir] [compiler-rt] [lld] [clang-tools-extra] [llvm] [lldb] [libcxx] [ELF] Implement R_RISCV_TLSDESC for RISC-V (PR #79239)

[Fangrui Song via cfe-commits]

MaskRay wrote:

"""
This branch is out-of-date with the base branch
Merge the latest changes from main into this branch.
This merge commit will be associated with ...
"""

Hmm. rebase + `spr diff` cannot fix it. I'll merge this manually.

https://github.com/llvm/llvm-project/pull/79239