[Bug target/57624] BZHI instrinsic is missing

[sgunderson at bigfoot dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57624

--- Comment #2 from sgunderson at bigfoot dot com ---
Shouldn't really the documentation say so, then? The entire GCC manual seems to
make no note of this header at all, as far as I can see.