[patch] libstdc++/62154 fix throw_with_nested and rethrow_if_nested

[Jonathan Wakely]

Rewritten to meet the C++11 spec, not the 2009 draft I used when
adding nested_exception.

I've used the builtin traits directly, to avoid making libsupc++
depend on <type_traits>, which shouldn't be necessary because
<type_traits> should be present for freestanding implementations, but
it isn't (PR 62159).

Tested x86_64-linux, committed to trunk.
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