Add a DecltypeType type.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@74099 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGDebugInfo.cpp b/lib/CodeGen/CGDebugInfo.cpp
index a2b8d13..fb1fefe 100644
--- a/lib/CodeGen/CGDebugInfo.cpp
+++ b/lib/CodeGen/CGDebugInfo.cpp
@@ -810,6 +810,9 @@
   case Type::TypeOf:
     return Slot = getOrCreateType(cast<TypeOfType>(Ty)->getUnderlyingType(),
                                   Unit);
+  case Type::Decltype:
+    return Slot = getOrCreateType(cast<DecltypeType>(Ty)->getUnderlyingExpr()
+                                  ->getType(), Unit);
   }
   
   return Slot;