[arm64] Negative immediates and lack of default Neon support

[Torbjörn Granlund]

Marc Glisse <marc.glisse at inria.fr> writes:

  Ah, indeed, clang-3.4 fails. I had only tested clang-3.5 and clang-3.6
  which both enable neon by default. I would be ok with ignoring
  releases 3.3 and 3.4 for aarch64 (preliminary support, largely
  rewritten for 3.5 according to the release notes), but I assume you
  will want to support them anyway...

I do indeed.

Does -mfpu=neon work with the newer clangs?

-- 
Torbjörn
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