[ELF2] Don't allocate more SymbolBodies than needed.

[davide]

Summary

We're aiming at not wasting space, but let's try to do it properly (hopefully).

[• rafael]

LGTM. Thanks!

lld/trunk/ELF/InputFiles.cpp

template <class ELFT> void elf2::ObjectFile<ELFT>::initializeSymbols() {
   StringRef StringTable = *StringTableOrErr;
 
   Elf_Sym_Range Syms = this->ELFObj->symbols(Symtab);
   uint32_t NumSymbols = std::distance(Syms.begin(), Syms.end());
   uint32_t FirstNonLocal = Symtab->sh_info;
   if (FirstNonLocal > NumSymbols)
     error("Invalid sh_info in symbol table");
   Syms = llvm::make_range(Syms.begin() + FirstNonLocal, Syms.end());
-  SymbolBodies.reserve(NumSymbols);
+  SymbolBodies.reserve(NumSymbols - FirstNonLocal);
   for (const Elf_Sym &Sym : Syms)
     SymbolBodies.push_back(createSymbolBody(StringTable, &Sym));
 }
 
 template <class ELFT>
 SymbolBody *elf2::ObjectFile<ELFT>::createSymbolBody(StringRef StringTable,
                                                      const Elf_Sym *Sym) {
   ErrorOr<StringRef> NameOrErr = Sym->getName(StringTable);