the legalization cost must be included to get an accurate estimation of the total cost of the scalarized vector. The inaccurate cost triggered unprofitable SLP vectorization on 32-bit X86. Summary: Include legalization overhead when computing scalarization cost Reviewers: hfinkel, nadav CC: chandlerc, rnk, llvm-commits Differential Revision: http://llvm-reviews.chandlerc.com/D2992 llvm-svn: 203509