[v3] typeinfo tuning

[Benjamin Kosnik]

> Could that be related to the fact that I now keep getting linker
> errors about std::range_error::~range_error() being undefined?
> The .o file is looking for _ZNSt11range_errorD2Ev but libstdc++ has
> D0Ev and D1Ev.

Indeed. Fixed thusly.

tested x86/linux

-benjamin
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