[ELF2] Use EntrySize, not 8, to advance the .plt buffer when writing

[hfinkel]

Summary

In preparation for making the size of a .plt entry target dependent, use the existing EntrySize variable when writing (instead of a hard-coded value). NFC.

[ruiu]

LGTM

[hfinkel]

r249720, thanks!

ELF/OutputSections.cpp

 
 template <class ELFT> void PltSection<ELFT>::writeTo(uint8_t *Buf) {
   uintptr_t Start = reinterpret_cast<uintptr_t>(Buf);
   for (const SymbolBody *E : Entries) {
     uint64_t GotEntryAddr = Out<ELFT>::Got->getEntryAddr(*E);
     uintptr_t InstPos = reinterpret_cast<uintptr_t>(Buf);
     uint64_t PltEntryAddr = (InstPos - Start) + this->getVA();
     Target->writePltEntry(Buf, GotEntryAddr, PltEntryAddr);
-    Buf += 8;
+    Buf += EntrySize;
   }
 }
 
 template <class ELFT> void PltSection<ELFT>::addEntry(SymbolBody *Sym) {
   Sym->setPltIndex(Entries.size());
   Entries.push_back(Sym);
 }