[PATCH][ARM64] Add big endian target, port over subtargetfeatures from AArch64

[James Molloy]

Hi Tim,

These two patches add a big endian target to LLVM for ARM64, and port across the missing subtarget features for neon, crypto and FP. While we're there, also port over the CPU support for A53 and A57.

It's *just* not trivial enough for me to be happy doing post-commit review, especially as I've touched the cyclone code and renamed the "arm64-generic" model to "generic" (for consistency).

The aim of this is just to get the features added - later patches will wire them up both in LLVM (for codegen) and Clang. The clang plumbing is the reason I need the big endian target to be supported in Triple.{h,cpp}.

Cheers,

James

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