Use SelectionDAG::getTargetConstant* helper functions. NFC.

Instead of SelectionDAG::getConstant directly to make it more obvious that we're creating target constants.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@268074 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed