IndexSequence: New divide&conquer implementation
IndexSequence: New divide&conquer implementation

Instead of recursively adding one index in make_index_sequence, create
an index sequence of N/2 and concatenate two of those sequences, with
one incremented by N/2.

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