[X86][AVX] Add some initial movmsk combine tests
Show failure to reduce the signbit extraction for 256-bit integer vectors on AVX1 targets where the pcmpgt/ashr has to be done with split 128-bit vectors.
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Show failure to reduce the signbit extraction for 256-bit integer vectors on AVX1 targets where the pcmpgt/ashr has to be done with split 128-bit vectors.