Remove an unnecessary restriction.  MIsNeedChainEdge() should be checked even when scheduler AliasAnalysis is not
enabled.  A good chunk of the MIsNeedChainEdge() is logic that is valid and should be applied even for targets
that are not using for alias analysis.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217706 91177308-0d34-0410-b5e6-96231b3b80d8