MSVC doesn't define __ARM_NEON, but neon is a necessary part of arm64,
so will always be there.
At the same time fix the NEON code for MSVC which has a different
idea of what the intrinsics types are, even if all the intrinsic
functions are the same. This has two consequences:
1. Since NEON lacks construction intrinsics except duplication, NEON mask constants needs to be built differently.
2. Since MSVC has all the NEON types aliases of the same underlying type, QSimdNeon cant do the same type based dispatch as before.
Fixes: QTBUG-127646
Pick-to: 6.8
Change-Id: I8038bb6bb4557e8ce29e3844f2742a97b4489818
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>
572aa7caa0