[ELF] - Simplify adjustSectionsBeforeSorting().

[grimar]

Summary

Does not seem we need to set SectionIndex here.
It is set in finalizeSections() later.

[ruiu]

LGTM

ELF/LinkerScript.cpp

 }
 
 void LinkerScript::adjustSectionsBeforeSorting() {
   // If the output section contains only symbol assignments, create a
   // corresponding output section. The bfd linker seems to only create them if
   // '.' is assigned to, but creating these section should not have any bad
   // consequeces and gives us a section to put the symbol in.
   uint64_t Flags = SHF_ALLOC;
-
-  for (int I = 0, E = Opt.Commands.size(); I != E; ++I) {
-    auto *Sec = dyn_cast<OutputSection>(Opt.Commands[I]);
+  for (BaseCommand * Cmd : Opt.Commands) {
+    auto *Sec = dyn_cast<OutputSection>(Cmd);
     if (!Sec)
       continue;
     if (Sec->Live) {
       Flags = Sec->Flags;
       continue;
     }
 
     if (isAllSectionDescription(*Sec))
       continue;
 
     Sec->Live = true;
-    Sec->SectionIndex = I;
     Sec->Flags = Flags;
   }
 }
 
 void LinkerScript::adjustSectionsAfterSorting() {
   // Try and find an appropriate memory region to assign offsets in.
   for (BaseCommand *Base : Opt.Commands) {
     if (auto *Sec = dyn_cast<OutputSection>(Base)) {