[PATCH] factor common code in signed_or_unsigned

[Rafael Espindola]

The attached patch factors common code to many signed_or_unsigned
language hooks. It also adds a default implementation that is used by
all non C/C++ frontends.

I am trying to remove this language hook. Removing it from C/C++
requires more work, but I believe that this patch is already a nice
cleanup.


Bootstrapped and regression tested with all languages enabled.

Cheers,
Rafael
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