[lld] [lld][Hexagon] Fix TLS GD PLT to only create PLT entry for __tls_get_addr (PR #180297)

[Brian Cain via llvm-commits]

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@@ -181,10 +182,21 @@ void Hexagon::scanSectionImpl(InputSectionBase &sec, Relocs<RelTy> rels) {
       continue;
     case R_HEX_GD_PLT_B22_PCREL:
     case R_HEX_GD_PLT_B22_PCREL_X:
-    case R_HEX_GD_PLT_B32_PCREL_X:
-      sym.setFlags(NEEDS_PLT);
-      sec.addReloc({R_PLT_PC, type, offset, addend, &sym});
+    case R_HEX_GD_PLT_B32_PCREL_X: {
+      // GD PLT: call foo at GDPLT becomes call __tls_get_addr. Create the
+      // __tls_get_addr symbol if needed and route the PLT entry to it
+      // instead of the TLS symbol.
+      Symbol *ta = ctx.symtab->find("__tls_get_addr");
----------------
androm3da wrote:

Like so

```
void elf::postScanRelocations(Ctx &ctx) {
  ctx.target->postScanRelocations();
  bool needsTlsIe = false;
  auto fn = [&](Symbol &sym) {
    auto flags = sym.flags.load(std::memory_order_relaxed);
    // ... 

```

https://github.com/llvm/llvm-project/pull/180297