K 10
svn:author
V 3
pfg
K 8
svn:date
V 27
2015-05-14T15:49:48.495222Z
K 7
svn:log
V 411
Add new __unreachable() builtin

This is one of the few post gcc4.2 builtins that has been implemented by
clang:

__builtin_unreachable is used to indicate that a specific point in the
program cannot be reached, even if the compiler might otherwise think it
can. This is useful to improve optimization and eliminates certain
warnings.

Hinted by:	NetBSD
Differential Revision:	https://reviews.freebsd.org/D2536

END