[PATCH] [AArch64] Add workaround for Cortex-A53 erratum (835769)

[Bradley Smith]

Use llvm_unreachable instead of directly asserting.

http://reviews.llvm.org/D5721

Files:
  lib/Target/AArch64/AArch64.h
  lib/Target/AArch64/AArch64FixCortexA53_835769.cpp
  lib/Target/AArch64/AArch64TargetMachine.cpp
  lib/Target/AArch64/CMakeLists.txt
  test/CodeGen/AArch64/aarch64-fix-cortex-a53-835769.ll
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