[Bug preprocessor/53690] [C++11] \u0000 and \U00000000 are wrongly encoded as U+0001.

[wjl at icecavern dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53690

--- Comment #12 from Wesley J. Landaker <wjl at icecavern dot net> ---
This bug is marked fixed, but it is still present in g++ 5.3.1.

$ g++ --version
g++ (Debian 5.3.1-4) 5.3.1 20151219
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
$ g++ -std=c++14 x.cpp
1 1 0 0 1 1 0 0