Reduce the complexity of the math unit test
Reduce the complexity of the math unit test

Test fewer SimdArray types in math.cpp to increase compilation speed and
execution time (Debug builds time out on the dashboard).

Signed-off-by: Matthias Kretz <372ea4eca737a13cd010ee806d4ce7b98ee71550@kde.org>

chr-engwer/Vc,chr-engwer/Vc,VcDevel/Vc,VcDevel/Vc,VcDevel/Vc,VcDevel/Vc,chr-engwer/Vc