Use ReadPtr, not ReadUIntPtr through a reinterpret_cast.
Thanks to Sebastian for the suggestion.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@59330 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/DeclSerialization.cpp b/lib/AST/DeclSerialization.cpp
index 04cb719..3df942e 100644
--- a/lib/AST/DeclSerialization.cpp
+++ b/lib/AST/DeclSerialization.cpp
@@ -167,8 +167,8 @@
     DeclCtx = reinterpret_cast<uintptr_t>(MDC) | 0x1;
     // Allow back-patching.  Observe that we register the variable of the
     // *object* for back-patching. Its actual value will get filled in later.
-    D.ReadUIntPtr(reinterpret_cast<uintptr_t&>(MDC->SemanticDC), SemaDCPtrID);
-    D.ReadUIntPtr(reinterpret_cast<uintptr_t&>(MDC->LexicalDC), LexicalDCPtrID);
+    D.ReadPtr(MDC->SemanticDC, SemaDCPtrID);
+    D.ReadPtr(MDC->LexicalDC, LexicalDCPtrID);
   }
 }