[X86][AVX2] Enable ZERO_EXTEND_VECTOR_INREG lowering of 256-bit vectors
Some necessary yak shaving before lowering *_EXTEND_VECTOR_INREG 256-bit vectors on AVX1 targets as suggested by D52964. Differential Revision: https://reviews.llvm.org/D52970 llvm-svn: 343991
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