simdize: helper trait to determine the number of braces
simdize: helper trait to determine the number of braces

With C++11 brace initialization can still be a bit awkward because with
aggregates it might be necessary to use more than one brace for
initialization.
These two traits whether a constructor call with two braces / one brace
is well-defined. For some reason ICC fails to compile the trait
correctly. Therefore the trait simply returns a good guess.

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

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