[Bug c++/52654] [C++11] Warn on overflow in user-defined literals

[3dw4rd at verizon dot net]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52654

--- Comment #2 from Ed Smith-Rowland <3dw4rd at verizon dot net> 2012-03-30 
14:30:20 UTC ---
I short-circuited the overflow check in libcpp in case the literal was resolved
in C++ FE as a raw literal.  The raw literal should be able to take any number
of digits.  Ditto the literal operator template.