TimeStampCounter: fix compile with __MIC__

If compiled for MIC, but without VC_IMPL_MIC (e.g. with Vc::Scalar), the
 #ifdef was wrong. Now it's safer with the additional check for __MIC__.

Signed-off-by: Matthias Kretz <kretz@kde.org>
Remove ugly Expand/Merge API

Now that we have simdarray and simd_cast this stuff can finally go as it
has a much better replacement. RIP.

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