[PATCH] AArch64: Add support for instruction prefetch intrinsic

[Yi Kong]

Hi t.p.northover,

Instruction prefetch is not implemented for AArch64, it is incorrectly translated into data prefetch instruction.

Properly implement `llvm.prefetch` intrinsic, supporting instruction prefetch.

http://reviews.llvm.org/D4777

Files:
  lib/Target/AArch64/AArch64ISelLowering.cpp
  test/CodeGen/AArch64/arm64-prefetch.ll
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