[NFC][ELF] Remove pointless NEEDS_TLSGD_TO_IE (#171046) NEEDS_TLSGD_TO_IE is only ever set when the symbol is preeptible, in which case addTpOffsetGotEntry will just add the symbol to the GOT and emit a symbolic tlsGotRel anyway, so there is no need to give it its own special case. As well as simplifying the code upstream, this is useful downstream for Morello, which doesn't really have a proper GD/IE-to-LE relaxation, and so for GD-to-IE can benefit from being able to use the optimisations addTpOffsetGotEntry has for non-preemptible symbols, rather than having to reimplement them here.
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