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/Frontend/PCHReader.cpp b/lib/Frontend/PCHReader.cpp
index 96f21f1..0ee0c90 100644
--- a/lib/Frontend/PCHReader.cpp
+++ b/lib/Frontend/PCHReader.cpp
@@ -1822,7 +1822,10 @@
     QualType UnderlyingType = GetType(Record[0]);
     return Context->getTypeOfType(UnderlyingType);
   }
-    
+   
+  case pch::TYPE_DECLTYPE:
+    return Context->getDecltypeType(ReadTypeExpr());
+
   case pch::TYPE_RECORD:
     assert(Record.size() == 1 && "incorrect encoding of record type");
     return Context->getTypeDeclType(cast<RecordDecl>(GetDecl(Record[0])));