[lld] [PAC][lld][AArch64][ELF] Support signed GOT (PR #113815)

[Fangrui Song via llvm-commits]

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@@ -668,6 +668,8 @@ void GotSection::addConstant(const Relocation &r) { relocations.push_back(r); }
 void GotSection::addEntry(const Symbol &sym) {
   assert(sym.auxIdx == ctx.symAux.size() - 1);
   ctx.symAux.back().gotIdx = numEntries++;
+  if (sym.hasFlag(NEEDS_GOT_AUTH))
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MaskRay wrote:

should be moved to `addGotAuthEntry`

https://github.com/llvm/llvm-project/pull/113815