Update Clang for 3.5 rebase (r209713).

Change-Id: I8c9133b0f8f776dc915f270b60f94962e771bc83
diff --git a/lib/Index/SimpleFormatContext.h b/lib/Index/SimpleFormatContext.h
index fde43ae..147323a 100644
--- a/lib/Index/SimpleFormatContext.h
+++ b/lib/Index/SimpleFormatContext.h
@@ -51,8 +51,8 @@
         llvm::MemoryBuffer::getMemBuffer(Content);
     const FileEntry *Entry =
         Files.getVirtualFile(Name, Source->getBufferSize(), 0);
-    Sources.overrideFileContents(Entry, Source, true);
-    assert(Entry != NULL);
+    Sources.overrideFileContents(Entry, Source);
+    assert(Entry != nullptr);
     return Sources.createFileID(Entry, SourceLocation(), SrcMgr::C_User);
   }