[SelectionDAG] Don't promote mask operand when widening mstore and mscatter.

If the mask needs to be promoted that should occur by the legalizer detecting the mask operand needs to be promoted not as a side effect of another action.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@319852 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed