SelectionDAG: Remove unnecessary uses of TargetLowering::getPointerTy()

If we have a binary operation like ISD:ADD, we can set the result type
equal to the result type of one of its operands rather than using
TargetLowering::getPointerTy().

Also, any use of DAG.getIntPtrConstant(C) as an operand for a binary
operation can be replaced with:
DAG.getConstant(C, OtherOperand.getValueType());

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189227 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index bbea113..bd127b5 100644
--- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -9877,7 +9877,7 @@
         SDValue CstOffset = DAG.getSelect(DL, Zero.getValueType(),
                                           Cond, One, Zero);
         AddToWorkList(CstOffset.getNode());
-        CPIdx = DAG.getNode(ISD::ADD, DL, TLI.getPointerTy(), CPIdx,
+        CPIdx = DAG.getNode(ISD::ADD, DL, CPIdx.getValueType(), CPIdx,
                             CstOffset);
         AddToWorkList(CPIdx.getNode());
         return DAG.getLoad(TV->getValueType(0), DL, DAG.getEntryNode(), CPIdx,