[PATCH] Change the policy of ZERO_EXTEND/SIGN_EXTEND for SelectionDAG builder and legalization

[Jiangning Liu]

Hi Tim,

OK. I removed the asserts and added your small case in the test.

Thanks,
-Jiangning

http://reviews.llvm.org/D4967

Files:
  lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  test/CodeGen/AArch64/atomic-ops.ll
  test/CodeGen/AArch64/rm_redundant_cmp.ll
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