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Summary: LSV wants to know the maximum size that can be loaded to a vector register. On X86, this always matches the maximum register width. Implement this accordingly and add a test to make sure that LSV can vectorize up to the maximum permissible width on X86. Reviewers: delena, arsenm Reviewed By: arsenm Subscribers: wdng, llvm-commits Differential Revision: https://reviews.llvm.org/D31504 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@299589 91177308-0d34-0410-b5e6-96231b3b80d8