Pack UsingDecl more.

88 -> 80 bytes on x86_64.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@147736 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Serialization/ASTReaderDecl.cpp b/lib/Serialization/ASTReaderDecl.cpp
index 6e73388..56e2d08 100644
--- a/lib/Serialization/ASTReaderDecl.cpp
+++ b/lib/Serialization/ASTReaderDecl.cpp
@@ -998,7 +998,7 @@
   D->setUsingLocation(ReadSourceLocation(Record, Idx));
   D->QualifierLoc = Reader.ReadNestedNameSpecifierLoc(F, Record, Idx);
   ReadDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record, Idx);
-  D->FirstUsingShadow = ReadDeclAs<UsingShadowDecl>(Record, Idx);
+  D->FirstUsingShadow.setPointer(ReadDeclAs<UsingShadowDecl>(Record, Idx));
   D->setTypeName(Record[Idx++]);
   if (NamedDecl *Pattern = ReadDeclAs<NamedDecl>(Record, Idx))
     Reader.getContext().setInstantiatedFromUsingDecl(D, Pattern);
diff --git a/lib/Serialization/ASTWriterDecl.cpp b/lib/Serialization/ASTWriterDecl.cpp
index 45ce779..46e251b 100644
--- a/lib/Serialization/ASTWriterDecl.cpp
+++ b/lib/Serialization/ASTWriterDecl.cpp
@@ -862,7 +862,7 @@
   Writer.AddSourceLocation(D->getUsingLocation(), Record);
   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
   Writer.AddDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record);
-  Writer.AddDeclRef(D->FirstUsingShadow, Record);
+  Writer.AddDeclRef(D->FirstUsingShadow.getPointer(), Record);
   Record.push_back(D->isTypeName());
   Writer.AddDeclRef(Context.getInstantiatedFromUsingDecl(D), Record);
   Code = serialization::DECL_USING;