Index: lib/Object/COFFImportFile.cpp
===================================================================
--- lib/Object/COFFImportFile.cpp
+++ lib/Object/COFFImportFile.cpp
@@ -36,6 +36,7 @@
   switch (Machine) {
   default:
     llvm_unreachable("unsupported machine");
+  case IMAGE_FILE_MACHINE_ARM64:
   case IMAGE_FILE_MACHINE_AMD64:
     return false;
   case IMAGE_FILE_MACHINE_ARMNT:
@@ -52,6 +53,8 @@
     return IMAGE_REL_AMD64_ADDR32NB;
   case IMAGE_FILE_MACHINE_ARMNT:
     return IMAGE_REL_ARM_ADDR32NB;
+  case IMAGE_FILE_MACHINE_ARM64:
+    return IMAGE_REL_ARM64_ADDR32NB;
   case IMAGE_FILE_MACHINE_I386:
     return IMAGE_REL_I386_DIR32NB;
   }