Revert r356688 "[X86] Don't avoid folding multiple use sign extended 8-bit immediate into instructions under optsize."

Looking back over how the one use optimization works, I don't think this is the right way to fix this.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@356866 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed