Don't record nested macro expansions in the preprocessing record,
it can only bring pain when dealing with preprocessor abuse (see: boost).

rdar://10898986

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@151427 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Serialization/ASTReader.cpp b/lib/Serialization/ASTReader.cpp
index dde54d6..efe70e0 100644
--- a/lib/Serialization/ASTReader.cpp
+++ b/lib/Serialization/ASTReader.cpp
@@ -1744,7 +1744,7 @@
           = F.PreprocessorDetailCursor.GetCurrentBitNo();
           
         if (!PP.getPreprocessingRecord())
-          PP.createPreprocessingRecord(true);
+          PP.createPreprocessingRecord();
         if (!PP.getPreprocessingRecord()->getExternalSource())
           PP.getPreprocessingRecord()->SetExternalSource(*this);
         break;
@@ -2288,7 +2288,7 @@
       
       unsigned StartingID;
       if (!PP.getPreprocessingRecord())
-        PP.createPreprocessingRecord(true);
+        PP.createPreprocessingRecord();
       if (!PP.getPreprocessingRecord()->getExternalSource())
         PP.getPreprocessingRecord()->SetExternalSource(*this);
       StartingID