[X86] Add BSR to isUseDefConvertible.
We already had BSF here as part of __builtin_ffs improvements and I was just wondering yesterday whether we should have BSR there. This addresses one issue from PR40090. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@349531 91177308-0d34-0410-b5e6-96231b3b80d8
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