[Patch] Fix libstdc++/34680 in mainline

[Paolo Carlini]

Hi,

now that __GXX_RTTI is available, it's possible to fix the two offending
uses. A subtle point is that, in order to consistently use across
optimization levels the available exported extern template
instantiations, we have to remove the inline specifier: probably, this
is still not bullet proof, but at least I checked that plain calls are
never inlined from -Os to -O3. Another observation, I'm not attempting
anything sophisticated on the other existing uses of run-time type
identification (i.e., dynamic_cast, typeid), in  the debug-mode and TR1
implementations, where we are not risking any regression.

Tested x86_64-linux.

Paolo.

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