[IR] Add 'Append' and 'AppendUnique' module flag behaviors.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172659 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Verifier/module-flags-1.ll b/test/Verifier/module-flags-1.ll
index 94e9817..e5feaf3 100644
--- a/test/Verifier/module-flags-1.ll
+++ b/test/Verifier/module-flags-1.ll
@@ -33,6 +33,14 @@
 !9 = metadata !{ i32 2, metadata !"bar", i32 51 }
 !10 = metadata !{ i32 3, metadata !"bar", metadata !{ metadata !"bar", i32 51 } }
 
+; Check that any 'append'-type module flags are valid.
+; CHECK: invalid value for 'append'-type module flag (expected a metadata node)
+!16 = metadata !{ i32 5, metadata !"flag-2", i32 56 }
+; CHECK: invalid value for 'append'-type module flag (expected a metadata node)
+!17 = metadata !{ i32 5, metadata !"flag-3", i32 57 }
+; CHECK-NOT: invalid value for 'append'-type module flag (expected a metadata node)
+!18 = metadata !{ i32 5, metadata !"flag-4", metadata !{ i32 57 } }
+
 ; Check that any 'require' module flags are valid.
 ; CHECK: invalid requirement on flag, flag is not present in module
 !11 = metadata !{ i32 3, metadata !"bar",
@@ -48,4 +56,5 @@
      metadata !{ metadata !"flag-1", i32 55 } }
 
 !llvm.module.flags = !{
-  !0, !1, !2, !3, !4, !5, !6, !7, !8, !9, !10, !11, !12, !13, !14, !15 }
+  !0, !1, !2, !3, !4, !5, !6, !7, !8, !9, !10, !11, !12, !13, !14, !15,
+  !16, !17, !18 }