[lld] [ELF] Range-check the x86-64 GD-to-IE TLS optimizations (PR #225228)

[Farid Zakaria via llvm-commits]

fzakaria wrote:

At Meta, we recently enabled support for `mcmodel=large` and I thought we had covered all the bugs since we were properly linking binaries; only to find this silent relaxation failure :/

https://github.com/llvm/llvm-project/pull/225228