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1) We should not try to simplify if the sext has multiple uses 2) There is no need to simplify is the source value is already sign-extended. Patch by Gil Rapaport <gil.rapaport@intel.com> Differential Revision: http://reviews.llvm.org/D6949 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229659 91177308-0d34-0410-b5e6-96231b3b80d8