Add test.

Author: bader

clang/test/CodeGen/unified-lto-module-flag.ll

@@ -0,0 +1,11 @@
+; Test that we do not duplicate the UnifiedLTO module flag.
+;
+; RUN: %clang_cc1 -emit-llvm -flto=full -funified-lto -o - %s | FileCheck %s
+
+; CHECK: !llvm.module.flags = !{!0, !1, !2, !3}
+!llvm.module.flags = !{!0, !1, !2, !3}
+
+!0 = !{i32 1, !"wchar_size", i32 2}
+!1 = !{i32 7, !"frame-pointer", i32 2}
+!2 = !{i32 1, !"EnableSplitLTOUnit", i32 1}
+!3 = !{i32 1, !"UnifiedLTO", i32 1}