Add support for a temporary forward decl type. We want this so we

can rauw forward declarations if we decide to emit the full type.

Part of rdar://10809898

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150024 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Analysis/DIBuilder.h

@@ -341,6 +341,10 @@ namespace llvm {
     DIType createTemporaryType();
     DIType createTemporaryType(DIFile F);
 
+    /// createForwardDecl - Create a temporary forward-declared type.
+    DIType createForwardDecl(unsigned Tag, StringRef Name, DIFile F,
+                             unsigned Line);
+
     /// retainType - Retain DIType in a module even if it is not referenced 
     /// through debug info anchors.
     void retainType(DIType T);