Remove ARM NEON SIMD - Redmine #3274
This SIMD suits ARMv7, which is not of interest for HPC (and does not build cleanly since around gcc 8, see #2990). It is no longer tested in master post-submit, so we should remove the code for the SIMD module, and CMake support for detecting to use it. Note that ARMv8 NEON ASIMD depends on headers from the NEON SIMD module, so we will need to consolidate those to keep it working.
(from redmine: issue id 3274, created on 2019-12-28 by mark.j.abraham)
- precedes #2990 (closed)