[lld] r248133 - [ELF2] Implement support for -discard-locals.

[Rafael Espíndola via llvm-commits]

> +        if (Config->DiscardLocals && SymName->startswith(".L"))
> +          continue;
>          ESym->st_name = (SymName) ? StrTabSec.getFileOff(*SymName) : 0;

It is probably a good idea to make this a static helper
(shouldIncludeInStaticSymtab).

If you are interested in this area (controlling what goes in the
static symtab), I think what is missing is

* Add a --discard-none.
* The default is to keep every symbol except if
  * The symbol is local (.L)
  * The symbol is defined in a SHF_MERGE section

As an extension, I think we should consider symbols with no names as
locals too. They are created when MC manages to avoid creating a .L
symbol, so there is no point in keeping them when discarding .L ones.

On this test, it probably makes sense to include the ASCII rendering of .strtab.

Cheers,
Rafael