enhance the new isel to handle the 'node already exists'
case of MorphNodeTo directly.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97417 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 4724673..f008fad 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -4660,7 +4660,7 @@
   return MorphNodeTo(N, Opc, VTs, Ops, 3);
 }
 
-/// MorphNodeTo - These *mutate* the specified node to have the specified
+/// MorphNodeTo - This *mutates* the specified node to have the specified
 /// return type, opcode, and operands.
 ///
 /// Note that MorphNodeTo returns the resultant node.  If there is already a