Add data formatter for libstdc++ tuple

Differential revision: https://reviews.llvm.org/D25733

llvm-svn: 284829
diff --git a/lldb/source/Plugins/Language/CPlusPlus/LibStdcpp.h b/lldb/source/Plugins/Language/CPlusPlus/LibStdcpp.h
index c6c5356..1c579af 100644
--- a/lldb/source/Plugins/Language/CPlusPlus/LibStdcpp.h
+++ b/lldb/source/Plugins/Language/CPlusPlus/LibStdcpp.h
@@ -36,6 +36,10 @@
                                              lldb::ValueObjectSP);
 
 SyntheticChildrenFrontEnd *
+LibStdcppTupleSyntheticFrontEndCreator(CXXSyntheticChildren *,
+                                       lldb::ValueObjectSP);
+
+SyntheticChildrenFrontEnd *
 LibStdcppVectorIteratorSyntheticFrontEndCreator(CXXSyntheticChildren *,
                                                 lldb::ValueObjectSP);