[PATCH] Thumb2: When optimizing for size, do not if-convert branches involving comparisons with zero.

[Peter Collingbourne]

Hi t.p.northover,

This allows the constant island pass to lower these branches to cbn?z
instructions, resulting in a shorter instruction sequence.

http://reviews.llvm.org/D9183

Files:
  lib/Target/ARM/ARMBaseInstrInfo.cpp
  test/CodeGen/Thumb2/2011-06-07-TwoAddrEarlyClobber.ll
  test/CodeGen/Thumb2/ifcvt-compare.ll
  test/CodeGen/Thumb2/v8_IT_3.ll

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