[ELF] - Simplify createFiles.

[grimar]

Summary

I suggest doing this change to
group paired options together.

[• espindola]

LGTM

[ruiu]

LGTM

My preference is to parenthesize the right hand side of =, but that's not a strong preference, so I'm ok in either way.

ELF/Driver.cpp

if (S == "elf" || S == "default")
     return false;
   error("unknown -format value: " + S +
         " (supported formats: elf, default, binary)");
   return false;
 }
 
 void LinkerDriver::createFiles(opt::InputArgList &Args) {
   for (auto *Arg : Args) {
-    switch (Arg->getOption().getUnaliasedOption().getID()) {
+    unsigned ID = Arg->getOption().getUnaliasedOption().getID();
+    switch (ID) {
     case OPT_library:
       addLibrary(Arg->getValue());
       break;
     case OPT_INPUT:
       addFile(Arg->getValue(), /*WithLOption=*/false);
       break;
     case OPT_defsym: {
       StringRef From;
       StringRef To;
       std::tie(From, To) = StringRef(Arg->getValue()).split('=');
       readDefsym(From, MemoryBufferRef(To, "-defsym"));
       break;
     }
     case OPT_script:
       if (Optional<std::string> Path = searchLinkerScript(Arg->getValue())) {
         if (Optional<MemoryBufferRef> MB = readFile(*Path))
           readLinkerScript(*MB);
         break;
       }
       error(Twine("cannot find linker script ") + Arg->getValue());
       break;
     case OPT_as_needed:
-      Config->AsNeeded = true;
+    case OPT_no_as_needed:
+      Config->AsNeeded = ID == OPT_as_needed;
       break;
     case OPT_format:
       InBinary = getBinaryOption(Arg->getValue());
       break;
-    case OPT_no_as_needed:
-      Config->AsNeeded = false;
-      break;
     case OPT_Bstatic:
-      Config->Static = true;
-      break;
     case OPT_Bdynamic:
-      Config->Static = false;
+      Config->Static = ID == OPT_Bstatic;
       break;
     case OPT_whole_archive:
-      InWholeArchive = true;
-      break;
     case OPT_no_whole_archive:
-      InWholeArchive = false;
+      InWholeArchive = ID == OPT_whole_archive;
       break;
     case OPT_just_symbols:
       if (Optional<MemoryBufferRef> MB = readFile(Arg->getValue())) {
         Files.push_back(createObjectFile(*MB));
         Files.back()->JustSymbols = true;
       }
       break;
     case OPT_start_lib:
-      InLib = true;
-      break;
     case OPT_end_lib:
-      InLib = false;
+      InLib = ID == OPT_start_lib;
       break;
     }
   }
 
   if (Files.empty() && errorCount() == 0)
     error("no input files");
 }