rounded_arith_opp doesn't work in Release configuration under msvc 14

[peter.azmanov@…]

Interval calculations with rounded_arith_opp in Release under msvc 14 result in zero-size intervals.

It seems that compiler optimizes too much, e.g. in

BOOST_UP_NEG(x / (-y));

it moves minus operation and calculates something like

BOOST_UP_NEG(-(x / y));

which returns the same result as

BOOST_UP(x / y);

It looks more like compiler bug. Attached patch is a workaround which solves the issue.

Tested on x64 platform with /fp:strict and /fp:precise under MS Visual Studio Community 2015 Version 14.0.24720.00 Update 1.