[PATCH] Implementation of std::experimental::simd of TS 19570 ed.2

[Matthias Kretz]

Hi,

the attached patch implements section 9 of the (about to be published) C++ 
Parallelism TS ed.2 (latest WD at http://www.open-std.org/jtc1/sc22/wg21/docs/
papers/2018/n4773.pdf)

The code has been extensively tested for x86_64 and needs some more work to 
work (not necessarily at full efficiency) for other targets.

The integration of the code into the libstdc++ tree is untested. However, it 
is header-only at this point, so it might just work (it never does, though, 
does it?).
Especially the full integration of my tests is a challenge, but I guess we can 
start small and expand the number of tests.

I also will have to work some more on naming convention.

Copyright assignment forms are in progress (I sent my part, but my employers 
part is still under way).

Cheers,
  Matthias

-- 
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 Dr. Matthias Kretz                                https://kretzfamily.de
 GSI Helmholtzzentrum für Schwerionenforschung             https://gsi.de
 SIMD easy and portable                     https://github.com/VcDevel/Vc
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