Add support for enum forward declarations.

Part of rdar://11570854

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157786 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/DIBuilder.cpp b/lib/Analysis/DIBuilder.cpp
index d6c6147..4fe0fc2 100644
--- a/lib/Analysis/DIBuilder.cpp
+++ b/lib/Analysis/DIBuilder.cpp
@@ -549,7 +549,7 @@
                                         uint64_t SizeInBits,
                                         uint64_t AlignInBits,
                                         DIArray Elements,
-                                        DIType ClassType) {
+                                        DIType ClassType, unsigned Flags) {
   // TAG_enumeration_type is encoded in DICompositeType format.
   Value *Elts[] = {
     GetTagConstant(VMContext, dwarf::DW_TAG_enumeration_type),
@@ -560,7 +560,7 @@
     ConstantInt::get(Type::getInt64Ty(VMContext), SizeInBits),
     ConstantInt::get(Type::getInt64Ty(VMContext), AlignInBits),
     ConstantInt::get(Type::getInt32Ty(VMContext), 0),
-    ConstantInt::get(Type::getInt32Ty(VMContext), 0),
+    ConstantInt::get(Type::getInt32Ty(VMContext), Flags),
     ClassType,
     Elements,
     ConstantInt::get(Type::getInt32Ty(VMContext), 0),