[PATCH] D11123: ARM: Fix cttz expansion on vector types.

[Logan Chien]

logan created this revision.
logan added reviewers: t.p.northover, grosbach, rengolin, chh.
logan added a subscriber: llvm-commits.
Herald added subscribers: rengolin, aemerson.

The 64/128-bit vector types will be treated as legal type when NEON is
enabled, but there was no matching pattern for @llvm.cttz.*()
intrinsics.  This commit fix the problem by lowering cttz to ctpop or
ctlz.

http://reviews.llvm.org/D11123

Files:
  lib/Target/ARM/ARMISelLowering.cpp
  test/CodeGen/ARM/cttz.ll
  test/CodeGen/ARM/cttz_vector.ll
  test/CodeGen/ARM/ctz.ll

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