[Modules] Make the DeclUpdates map be processed in insertion order.

This fixes my stress tests non-determinism so far. However, I've not
started playing with templates, friends, or terrible macros. I've found
at least two more seeming instabilities and am just waiting for a test
case to actually trigger them.

llvm-svn: 233162

1 files changed, 1 insertions, 1 deletions

diff --git a/clang/include/clang/Serialization/ASTWriter.h b/clang/include/clang/Serialization/ASTWriter.h
index 1d872a8c051..d120c98553f 100644
--- a/clang/include/clang/Serialization/ASTWriter.h
+++ b/clang/include/clang/Serialization/ASTWriter.h
@@ -321,7 +321,7 @@ private:
   };
 
   typedef SmallVector<DeclUpdate, 1> UpdateRecord;
-  typedef llvm::DenseMap<const Decl *, UpdateRecord> DeclUpdateMap;
+  typedef llvm::MapVector<const Decl *, UpdateRecord> DeclUpdateMap;
   /// \brief Mapping from declarations that came from a chained PCH to the
   /// record containing modifications to them.
   DeclUpdateMap DeclUpdates;