Make sure we get extension diagnostics for GCC's complex extensions.
Now we emit the following when -pedantic-errors is enabled...
[dylan:~/llvm/tools/clang] admin% ../../Debug/bin/clang complex.c -pedantic-errors
complex.c:4:3: error: ISO C does not support '++'/'--' on complex integer types
++x;
^ ~
complex.c:9:7: error: ISO C does not support '~' for complex conjugation
X = ~Y;
^
complex.c:10:7: error: ISO C does not support '~' for complex conjugation
x = ~y;
^
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@41362
91177308-0d34-0410-b5e6-
96231b3b80d8