use llvm::DenseMap instead of std::map

llvm-svn: 150547
diff --git a/lld/lib/Core/SymbolTable.cpp b/lld/lib/Core/SymbolTable.cpp
index 1b940cc..cc4c935 100644
--- a/lld/lib/Core/SymbolTable.cpp
+++ b/lld/lib/Core/SymbolTable.cpp
@@ -165,7 +165,7 @@
 }
 
 
-unsigned SymbolTable::MyMappingInfo::getHashValue(const DefinedAtom * const atom) {
+unsigned SymbolTable::AtomMappingInfo::getHashValue(const DefinedAtom * const atom) {
   unsigned hash = atom->size();
   if ( atom->contentType() != DefinedAtom::typeZeroFill ) {
     llvm::ArrayRef<uint8_t> content = atom->rawContent();
@@ -180,7 +180,7 @@
 }
 
 
-bool SymbolTable::MyMappingInfo::isEqual(const DefinedAtom * const l, 
+bool SymbolTable::AtomMappingInfo::isEqual(const DefinedAtom * const l, 
                                          const DefinedAtom * const r) {
   if ( l == r )
     return true;