K 10
svn:author
V 6
jilles
K 8
svn:date
V 27
2019-02-10T22:23:05.774726Z
K 7
svn:log
V 609
sh: Restore $((x)) error checking after fix for $((-9223372036854775808))

SVN r342880 was designed to fix $((-9223372036854775808)) and things like
$((0x8000000000000000)) but also broke error detection for values of
variables without dollar sign ($((x))).

For compatibility, overflow in plain literals continues to be ignored and
the value is clamped to the boundary (except 9223372036854775808 which is
changed to -9223372036854775808).

Reviewed by:	se (although he would like error checking to be removed)
MFC after:	2 weeks
X-MFC-with:	r342880
Differential Revision:	https://reviews.freebsd.org/D18926

END