[ELF] Add an apostrophe after a file name when reporting discarded sections.

[ruiu]

LGTM

lld/trunk/ELF/OutputSections.cpp

return Type == SHT_NOBITS || Type == SHT_PROGBITS || Type == SHT_INIT_ARRAY ||
          Type == SHT_PREINIT_ARRAY || Type == SHT_FINI_ARRAY ||
          Type == SHT_NOTE;
 }
 
 void elf::reportDiscarded(InputSectionBase *IS) {
   if (!Config->PrintGcSections)
     return;
   message("removing unused section from '" + IS->Name + "' in file '" +
-          IS->File->getName());
+          IS->File->getName() + "'");
 }
 
 void OutputSectionFactory::addInputSec(InputSectionBase *IS,
                                        StringRef OutsecName) {
   // Sections with the SHT_GROUP attribute reach here only when the - r option
   // is given. Such sections define "section groups", and InputFiles.cpp has
   // dedup'ed section groups by their signatures. For the -r, we want to pass
   // through all SHT_GROUP sections without merging them because merging them