added: symbol demangling helper

this is trivial enough to carry ourself instead of
relying on dune-common

opm/common/utility/Demangle.hpp

@@ -0,0 +1,32 @@
+/*
+  Copyright 2022 Equinor ASA.
+
+  This file is part of the Open Porous Media project (OPM).
+
+  OPM is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  OPM is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with OPM.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef OPM_DEMANGLE_HPP
+#define OPM_DEMANGLE_HPP
+
+#include <string>
+
+namespace Opm {
+
+//! \brief Returns demangled name of symbol.
+//! \details Non-demangled name is return if demangling is not supported
+std::string demangle(const char* mangled_symbol);
+
+}
+#endif //OPM_DEMANGLE_HPP