Implement pack expansions whose pattern is a base-specifier.

llvm-svn: 122782
diff --git a/clang/lib/Serialization/ASTReader.cpp b/clang/lib/Serialization/ASTReader.cpp
index 084778d..dd8807f 100644
--- a/clang/lib/Serialization/ASTReader.cpp
+++ b/clang/lib/Serialization/ASTReader.cpp
@@ -4292,7 +4292,9 @@
   AccessSpecifier AS = static_cast<AccessSpecifier>(Record[Idx++]);
   TypeSourceInfo *TInfo = GetTypeSourceInfo(F, Record, Idx);
   SourceRange Range = ReadSourceRange(F, Record, Idx);
-  return CXXBaseSpecifier(Range, isVirtual, isBaseOfClass, AS, TInfo);
+  SourceLocation EllipsisLoc = ReadSourceLocation(F, Record, Idx);
+  return CXXBaseSpecifier(Range, isVirtual, isBaseOfClass, AS, TInfo, 
+                          EllipsisLoc);
 }
 
 std::pair<CXXBaseOrMemberInitializer **, unsigned>