[turbofan] Introduce WordRor machine operator.

src/compiler/machine-node-factory.h

Index: src/compiler/machine-node-factory.h
diff --git a/src/compiler/machine-node-factory.h b/src/compiler/machine-node-factory.h
index 721b1ff75dd2d283778030d5e72c170293e41daa..cc9d5d903596c472feb0841c756f224817f4600d 100644
--- a/src/compiler/machine-node-factory.h
+++ b/src/compiler/machine-node-factory.h
@@ -119,11 +119,7 @@ class MachineNodeFactory {
     return NEW_NODE_2(MACHINE()->WordSar(), a, b);
   }
   Node* WordRor(Node* a, Node* b) {
-    if (MACHINE()->is32()) {
-      return Word32Ror(a, b);
-    } else {
-      return Word64Ror(a, b);
-    }
+    return NEW_NODE_2(MACHINE()->WordRor(), a, b);
   }
   Node* WordEqual(Node* a, Node* b) {
     return NEW_NODE_2(MACHINE()->WordEqual(), a, b);
@@ -165,8 +161,7 @@ class MachineNodeFactory {
     return NEW_NODE_2(MACHINE()->Word32Sar(), a, b);
   }
   Node* Word32Ror(Node* a, Node* b) {
-    return Word32Or(Word32Shl(a, Int32Sub(Int32Constant(32), b)),
-                    Word32Shr(a, b));
+    return NEW_NODE_2(MACHINE()->Word32Ror(), a, b);
   }
   Node* Word32Equal(Node* a, Node* b) {
     return NEW_NODE_2(MACHINE()->Word32Equal(), a, b);
@@ -196,8 +191,7 @@ class MachineNodeFactory {
     return NEW_NODE_2(MACHINE()->Word64Sar(), a, b);
   }
   Node* Word64Ror(Node* a, Node* b) {
-    return Word64Or(Word64Shl(a, Int64Sub(Int64Constant(64), b)),
-                    Word64Shr(a, b));
+    return NEW_NODE_2(MACHINE()->Word64Ror(), a, b);
   }
   Node* Word64Equal(Node* a, Node* b) {
     return NEW_NODE_2(MACHINE()->Word64Equal(), a, b);