[ELF] Add skeleton for X86-64 relocations.

llvm-svn: 171578
diff --git a/lld/lib/ReaderWriter/ELF/ReferenceKinds.cpp b/lld/lib/ReaderWriter/ELF/ReferenceKinds.cpp
index e15d3b3..083e843 100644
--- a/lld/lib/ReaderWriter/ELF/ReferenceKinds.cpp
+++ b/lld/lib/ReaderWriter/ELF/ReferenceKinds.cpp
@@ -30,6 +30,8 @@
     return std::unique_ptr<KindHandler>(new HexagonKindHandler());
   case llvm::ELF::EM_386:
     return std::unique_ptr<KindHandler>(new X86KindHandler());
+  case llvm::ELF::EM_X86_64:
+    return std::unique_ptr<KindHandler>(new X86_64KindHandler());
   case llvm::ELF::EM_PPC:
     return std::unique_ptr<KindHandler>(new PPCKindHandler(endian));
   default: