[PATCH] [AArch64] Fix a pattern match failure caused by creating improper CONCAT_VECTOR.

[Kevin Qin]

Hi t.p.northover,

Hi Tim,

This patch is to fix a pattern match failure when handling IR like,
 %tmp2 = fptosi <4 x double> %tmp1 to <4 x i16>

Failure reason is, ReconstructShuffle() wrongly created a CONCAT_VECTOR trying to concat 2 of v2i32 into v4i16. This patch can fix this issue and try to generate UZP1  instead of lots of MOV and INS. Please review.

http://reviews.llvm.org/D4080

Files:
  lib/Target/AArch64/AArch64ISelLowering.cpp
  test/CodeGen/AArch64/arm64-convert-v4f64.ll
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