MFC r258779,r258780,r258787,r258822:

MFC r258779,r258780,r258787,r258822:

Fix undefined behavior: (1 << 31) is not defined as 1 is an int and this
shifts into the sign bit.  Instead use (1U << 31) which gets the
expected result.

Similar to the (1 << 31) case it is not defined to do (2 << 30).

This fix is not ideal as it assumes a 32 bit int, but does fix the issue
for most cases.

A similar change was made in OpenBSD.

git-svn-id: svn://svn.freebsd.org/base/stable/10@261455 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f