[X86] Remove unneeded code from combineGatherScatter that used to delte...
[X86] Remove unneeded code from combineGatherScatter that used to delte SIGN_EXTEND_INREG nodes created during legalization of v2i1/v4i1 masks on KNL. v2i1/v4i1 are now legal on KNL so no sign_extend_inreg is generated. llvm-svn: 321968
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