[v3] Fix libstdc++/58815

[Daniel Krügler]

2013/10/23 Paolo Carlini <paolo.carlini@oracle.com>:
> Hi,
>
> for details see the audit trail. Tested x86_64-linux, committed to mainline.

I suggest to initialize the decimal values in the new unit tests. If

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3407.html

would be applied these initializations would become
default-initializations thus leaving them uninitialized. This might
trap during the static_cast.

- Daniel