simdize: disambiguate get_dispatcher
simdize: disambiguate get_dispatcher

Previously the function signature was the same except for the (trailing)
return type. I'm not sure why this compiled on GCC and clang. Since ICC
complained, the return type is now part of the template argument list
and additionally a dummy argument makes the function signature
different.

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

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