Sanjoy Das e18cdd45dd Revert "[LSR] Generate and use zero extends"
This reverts commit r243348 and r243357.  They caused PR24347.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@243939 91177308-0d34-0410-b5e6-96231b3b80d8
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