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[X86][AVX] Fix lowering of X86ISD::VZEXT_MOVL for 128-bit -> 256-bit …
…extension The lowering patterns for X86ISD::VZEXT_MOVL for 128-bit to 256-bit vectors were just copying the lower xmm instead of actually masking off the first scalar using a blend. Fix for PR25320. Differential Revision: http://reviews.llvm.org/D14151 llvm-svn: 253561
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