[Patch] Fix libstdc++/12352

[Paolo Carlini]

Hi,

the below doesn't hope to fix all the exception safety problems in
localename.cc (i.e., do we want the *strong* exception safety
guarantee, eventually?) but seems to me a definite improvement, fixes
the testcase and variants, ans it's already quite big as is.

Tested x86-linux. Do you like it?

In case, I promise to study in more detail these issues in the next
monts: I'm afraid Tom Cargill wouldn't happy with our past stance wrt
exception safety ;)

Paolo.

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