[PATCH] [AArch64] Generate tbz/tbnz when comparing against zero.

[Chad Rosier]

Revised patch based on Jiangning's feedback.  Please take a look.

http://reviews.llvm.org/D4440

Files:
  lib/Target/AArch64/AArch64ISelLowering.cpp
  test/CodeGen/AArch64/tbz-tbnz.ll
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