Sanjay Patel 7ff284e6ae [x86] add tests for potential negation folds
These are the backend equivalents for the tests added in r284627.
The patterns may emerge late, so we should have folds for these in the DAG too.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@284842 91177308-0d34-0410-b5e6-96231b3b80d8
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