[llvm-commits] Fix in zmovl pattern on AVX

[Demikhovsky, Elena]

Currently we have the following failure
LLVM ERROR: Cannot select: 0x3c5050: v4i64 = X86ISD::VZEXT_MOVL 0x3c4f50 [ID=8]
  0x3c4f50: v4i64 = insert_subvector 0x3c4e50, 0x3bfd90, 0x3c0990 [ID=6]
    0x3c4e50: v4i64 = undef [ID=4]
    0x3bfd90: v2i64,ch = load 0x391b18, 0x3bfb90, 0x3bfb90<LD16[undef]> [ORD=1] [ID=5]
      0x3bfb90: i64 = undef [ORD=1] [ID=1]
      0x3bfb90: i64 = undef [ORD=1] [ID=1]

for this code
define <3 x i64> @t4() nounwind {
entry:
  %0 = load <2 x i64> addrspace(1)* undef, align 16
  %1 = extractelement <2 x i64> %0, i32 0
  %2 = insertelement <3 x i64> <i64 undef, i64 0, i64 0>, i64 %1, i32 0
  ret <3 x i64> %2
}

I added a pattern to X86InstrSSE.td and a test. This is similar to Evan changes in revision 146191, so I added this test case to Evan's test.
Please review.

Thanks.
- Elena


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