use exp10 and cbrt from vectorclass when enabled

[jehuty0shift]

Hello,
I tried to compile ClikHouse with vector class suport enabled and it failed at two places :

ClickHouse/dbms/src/Functions/FunctionsMath.h:489:5: error: could not convert template argument ‘preciseExp10’ from ‘double(double) noexcept’ to ‘Vec2d (*)(const Vec2d&)’
     preciseExp10
     ^~~~~~~~~~~~

ClickHouse/dbms/src/Functions/FunctionsMath.h:500:28: error: could not convert template argument ‘ Power_rational<1, 3>::pow<VTYPE>’ from ‘<unresolved overloaded function type>’ to ‘Vec2d (*)(const Vec2d&)’
     Power_rational<1, 3>::pow

Power_rational::pow function is non static (even the specialized functions). I don't understand how it was compiling but i'm maybe missing something here.
So i changed the code to call the vectorized version of cbrt and exp10 when vectorclass is Enabled.

Compiled with gcc-7:
gcc-7 --version
gcc-7 (Ubuntu 7.2.0-1ubuntu1~16.04) 7.2.0

I hereby agree to the terms of the CLA available at: https://yandex.ru/legal/cla/?lang=en

[alexey-milovidov]

Thank you!
We ceased to use vectorclass in our packages to comply the licence.
It was left as an option, but with no CI tests.