Shift rather than dividing with a power of 2

[code423n4]

Handle

0x0x0x

Vulnerability details

It costs less gas to shift than division. So rather than dividing by a power of 2, right shift can be used to save gas.

Occurrences

./libraries/MathLib.sol:43:        return ((a * WAD) + (b / 2)) / b;
./libraries/MathLib.sol:55:        return ((a + (n / 2)) / n) * n;
./libraries/MathLib.sol:67:        return ((a * b) + (WAD / 2)) / WAD;
./libraries/MathLib.sol:85:            uint256 x = y / 2 + 1;
./libraries/MathLib.sol:88:                x = (y / x + x) / 2;

[0xean]

dupe of #100