[ELF] - Refactor of LinkerScript<ELFT>::getPhdrIndicesForSection

[grimar]

Summary

Previously it was harder to read and also has a error:
command kind was not checked.

[ruiu]

LGTM

ELF/LinkerScript.cpp

461

Please replace [PhdrName] with [&] as the function body is so short.

ELF/LinkerScript.cpp

 }
 
 // Returns indices of ELF headers containing specific section, identified
 // by Name. Each index is a zero based number of ELF header listed within
 // PHDRS {} script block.
 template <class ELFT>
 std::vector<size_t>
 LinkerScript<ELFT>::getPhdrIndicesForSection(StringRef Name) {
+  for (SectionsCommand &Cmd : Opt.Commands) {
+    if (Cmd.Kind != SectionKind || Cmd.Name != Name)
+      continue;
+
     std::vector<size_t> Indices;
-  auto ItSect = std::find_if(
-      Opt.Commands.begin(), Opt.Commands.end(),
-      [Name](const SectionsCommand &Cmd) { return Cmd.Name == Name; });
-  if (ItSect != Opt.Commands.end()) {
-    SectionsCommand &SecCmd = (*ItSect);
-    for (StringRef PhdrName : SecCmd.Phdrs) {
+    for (StringRef PhdrName : Cmd.Phdrs) {
       auto ItPhdr = std::find_if(
           Opt.PhdrsCommands.rbegin(), Opt.PhdrsCommands.rend(),
           [PhdrName](PhdrsCommand &Cmd) { return Cmd.Name == PhdrName; });
       if (ItPhdr == Opt.PhdrsCommands.rend())
         error("section header '" + PhdrName + "' is not listed in PHDRS");
       else
         Indices.push_back(std::distance(ItPhdr, Opt.PhdrsCommands.rend()) - 1);
     }
-  }
     return Indices;
   }
+  return {};
+}
 
 class elf::ScriptParser : public ScriptParserBase {
   typedef void (ScriptParser::*Handler)();
 
 public:
   ScriptParser(StringRef S, bool B) : ScriptParserBase(S), IsUnderSysroot(B) {}
 
   void run();