[Frontend] Remove HeaderSearchOptions::Entry::IsInternal, which is unused.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@173866 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Serialization/ASTReader.cpp b/lib/Serialization/ASTReader.cpp
index c07e1e9..ac86d41 100644
--- a/lib/Serialization/ASTReader.cpp
+++ b/lib/Serialization/ASTReader.cpp
@@ -3691,10 +3691,8 @@
       = static_cast<frontend::IncludeDirGroup>(Record[Idx++]);
     bool IsFramework = Record[Idx++];
     bool IgnoreSysRoot = Record[Idx++];
-    bool IsInternal = Record[Idx++];
     HSOpts.UserEntries.push_back(
-      HeaderSearchOptions::Entry(Path, Group, IsFramework, IgnoreSysRoot,
-                                 IsInternal));
+      HeaderSearchOptions::Entry(Path, Group, IsFramework, IgnoreSysRoot));
   }
 
   // System header prefixes.