PATCH: Update longlong.h from GCC 4.7.0

[Roland McGrath]

> This patch updates longlong.h from GCC 4.7.0 so that we always use
> __builtin_clzll and __builtin_ctzll for x86-64 DImode to support x32.
> OK to install?

Do all supported GCC versions have the ll variants of the builtins?
If so, then the right thing to do is just to update longlong.h wholesale to
the GCC trunk version verbatim.  For that, the log entry doesn't need to
list the individual changes, just "Update from GCC."


Thanks,
Roland