[PATCH] [AArch64] Add v8.1a atomic instructions

[Vladimir Sukharev]

Hi Tim, thank you for your hints and comments. I'll address it soon.
Meanwhile shouldn't we perform careful review/re-do/re-base process from the first patch in the dependency chain( http://reviews.llvm.org/D8496 )?
That way I could save efforts rebasing the rest of chain after every correction..


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