[Patch] Add C11 uchar/wchar related __STDC_* definitions

[Ed Schouten]

Hi Dmitri,

2013/5/25 Dmitri Gribenko <gribozavr at gmail.com>:
> Please add tests.  (Tests for these macros should probably go into
> test/Preprocessor/init.c).

Added! (Please refresh)

http://80386.nl/pub/clang-c11-uchar.txt

> Should this be conditional on C11 or C++11?

Though these definitions are only part of C11/C++11, I think it would
be safer to just define them unconditionally. For example, a piece of
code assumes C11, but is not built with -std=c11, it may wrongly
assume !defined(__STDC_MB_MIGHT_NEQ_WC__), which could have disastrous
side-effects.

--
Ed Schouten <ed at 80386.nl>