Use addFlag to add the enum class attribute.

This has the side effect of using DW_FORM_flag_present on dwarf4 and above.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191991 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp b/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
index a487b10..3ff6d68 100644
--- a/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
@@ -1014,7 +1014,7 @@
     DIType DTy = CTy.getTypeDerivedFrom();
     if (DTy) {
       addType(&Buffer, DTy);
-      addUInt(&Buffer, dwarf::DW_AT_enum_class, dwarf::DW_FORM_flag, 1);
+      addFlag(&Buffer, dwarf::DW_AT_enum_class);
     }
   }
     break;