[cfe-dev] RFC: switch default C language mode from gnu99 to gnu11

[Richard Smith]

I'd like to switch the default language mode for C compilations from gnu99
to gnu11. The only effect of this change would be to turn some extension
warnings off, change the default value of __STDC_VERSION__, and change the
default value of some __has_feature(...) checks; we allow all of C11 as an
extension in C99 mode anyway.

Also of note: GCC trunk just switched from C89 to C11 by default.
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