This patch does three related things for the moxie port...

1. Changes char to be unsigned by default
2. Changes WCHAR_TYPE from long int to unsigned int
3. Zero- and sign-extends values properly, sometimes using the new
    sign-extension instructions.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@209047 138bc75d-0d04-0410-961f-82ee72b054a4