[PATCH] Update config.guess and config.sub for AArch64

[Renato Golin]

Hi t.p.northover, chandlerc,

Newer versions can cope with aarch64:Linux:* cases that our current can't. I've tested on ARM, AArch64 and x86_64 without problems, I can't see why anything bad could happen.

http://llvm-reviews.chandlerc.com/D2792

Files:
  autoconf/config.guess
  autoconf/config.sub
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