[C++ PATCH] ICE with invalid user-defined literals (PR c++/51420)

[Ed Smith-Rowland]

gcc/testsuite:

2011-12-06  Ed Smith-Rowland <3dw...@verizon.net>

    PR c++/51420
    * g++.dg/cpp0x/pr51420.C: New.


gcc/cp:

2011-12-06  Ed Smith-Rowland <3dw...@verizon.net>

    PR c++/51420
    * parser.c (lookup_literal_operator): Check that current overload
    is function_type.