7.162 --type_traits_helpers, --no_type_traits_helpers

Enables and disables support for C++ type traits helpers (such as __is_union and __has_virtual_destructor).

Type traits helpers are enabled in non-GNU C++ mode by default, and in GNU C++ mode when emulating g++ 4.3 and later.
Related reference
7.77 --gnu_version=version
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