[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

Ed Smith-Rowland <3dw4rd at verizon dot net> changed:

           What    |Removed                     |Added
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  Attachment #27103|0                           |1
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--- Comment #13 from Ed Smith-Rowland <3dw4rd at verizon dot net> 2012-04-06 
15:32:39 UTC ---
Created attachment 27105
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27105
New patch incorporating recent suggestions.

Using warning_at, OPT_Woverflow, etc.
Added a new enum for overflow type and used it everywhere.

regtested fine on x86_64-linux-gnu.