Introduce always constexpr variants of qCountTrailingZeroBits

qt_builtin_ctz is unfortunately not constexpr on MSVC, so the whole
function cannot be used in constexpr contexts, unless v is exactly 0. As we
don't have std::is_costant_evaluated until C++20, we need to introduce a new
helper function, which always works in constexpr contexts.

Change-Id: I36290acb61e430d6bdb3da112a9b2263be4b9fbf
Reviewed-by: Tor Arne Vestbø <[email protected]>
Reviewed-by: Lars Knoll <[email protected]>

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