Revert "Simplify a variable type by using StringRef instead of CachedHashStringRef."

This reverts commit r303787.

It caused a slowdown in fast links. That is, links with no debug info
or optimizations.

llvm-svn: 303925

1 files changed, 1 insertions, 1 deletions

diff --git a/lld/ELF/SymbolTable.cpp b/lld/ELF/SymbolTable.cpp
index dae294fca6e..ed8a790c959 100644
--- a/lld/ELF/SymbolTable.cpp
+++ b/lld/ELF/SymbolTable.cpp
@@ -122,7 +122,7 @@ template <class ELFT> void SymbolTable<ELFT>::addCombinedLTOObject() {
 
   for (InputFile *File : LTO->compile()) {
     ObjectFile<ELFT> *Obj = cast<ObjectFile<ELFT>>(File);
-    DenseSet<StringRef> DummyGroups;
+    DenseSet<CachedHashStringRef> DummyGroups;
     Obj->parse(DummyGroups);
     ObjectFiles.push_back(Obj);
   }