[PATCH] [AArch64] Fix fast-isel of cbz of i1, i8, i16

[Oliver Stannard]

This fixes a miscompilation in the AArch64 fast-isel which was triggered when a branch is based on an icmp with condition eq or ne, and type i1, i8 or i16. The cbz instruction compares the whole 32-bit register, so values with the bottom 1, 8 or 16 bits clear would cause the wrong branch to be taken.

http://reviews.llvm.org/D5935

Files:
  lib/Target/AArch64/AArch64FastISel.cpp
  test/CodeGen/AArch64/fast-isel-cbz.ll
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