[InstCombine] handle zero constant vectors for LE/GE comparisons too

Enhancement to: http://reviews.llvm.org/rL269426
With discussion in: http://reviews.llvm.org/D17859

This should complete the fixes for: PR26701, PR26819:
https://llvm.org/bugs/show_bug.cgi?id=26701
https://llvm.org/bugs/show_bug.cgi?id=26819
 


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@269439 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed