[lld] [ELF] Fix TLS GD against non-preemptible dynamic symbols in DSOs (PR #207881)

[Jessica Clarke via llvm-commits]

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jrtc27 wrote:

foo is already hidden, so I figured it was ok to reuse bar for something different. I assume the only reason it existed in the first place was to have a different constant offset in .got, and this altered bar does that too.

https://github.com/llvm/llvm-project/pull/207881