[PATCH][AVX512] Broken icmp for <16 x i64>.

[Bader, Aleksey A]

Hi,

This patch fixes the following test on AVX512:
define <16 x i1> @test1(<16 x i64> %a, <16 x i64> %b) nounwind {
  %res = icmp eq <16 x i64> %a, %b
  ret <16 x i1> %res
}

Currently llc produces

        vpcmpeqq        %zmm3, %zmm1, %k0
        kmovw   %k0, (%rsp)
        vpcmpeqq        %zmm2, %zmm0, %k0
        kmovw   %k0, (%rsp)
       kmovw   (%rsp), %k0
        kmovw   %k0, (%rdi)

Thanks,
Alexey

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