[lld] [ELF] Merge exportDynamic into versionId (PR #71272)

[Igor Kudrin via llvm-commits]

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igorkudrin wrote:

Maybe the condition in `combineVersionedSymbol()` should be updated to avoid reading out of bounds.
```
    if (sym2->versionId > VER_NDX_GLOBAL
            ? config->versionDefinitions[sym2->versionId].name == suffix1 + 1
            : sym1->section == sym2->section && sym1->value == sym2->value) {
```

https://github.com/llvm/llvm-project/pull/71272