Fix a typo in a comment.

llvm-svn: 50562
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index dfd422a..18bb040 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -3409,7 +3409,7 @@
   if (SDNode *Existing = FindModifiedNodeSlot(N, Ops, NumOps, InsertPos))
     return SDOperand(Existing, InN.ResNo);
   
-  // Nope it doesn't.  Remove the node from it's current place in the maps.
+  // Nope it doesn't.  Remove the node from its current place in the maps.
   if (InsertPos)
     RemoveNodeFromCSEMaps(N);